diff --git a/doc/readme_ENG.txt b/doc/readme_ENG.txt
index 63da21d..765e626 100644
--- a/doc/readme_ENG.txt
+++ b/doc/readme_ENG.txt
@@ -4,20 +4,7 @@ WORLD is free software for high-quality speech analysis, manipulation and synthe
 It can estimate Fundamental frequency (F0), aperiodicity and spectral envelope
 and also generate the speech like input speech with only estimated parameters.
 
-2. Usage
-Please see test.cpp.
-
-(1) F0 estimation by Dio()
-(1-1) F0 is refined by StoneMask() if you need more accurate result.
-(2) Spectral envelope estimation by CheapTrick()
-(3) Aperiodicity estimation by D4C().
-(4) You can manipulation these parameters in this phase. 
-(5) Voice synthesis by Synthesis().
-
-English document is written by a Japanese poor editor.
-I willingly accept your kind indication on my English text.
-
-3. License
+1. License
 WORLD is free software, and you can redistribute it and 
 modify it under the terms of the modified BSD License.
 Please see copying.txt for more information.
@@ -25,7 +12,7 @@ You can use this program for business, while I hope that
 you contact me after you developed software with WORLD.
 This information is crucial to obtain a grant to develop WORLD.
 
-4. Contacts
+2. Contacts
 WORLD was written by Masanori Morise.
-You can contact him via e-mail (mmorise [at] yamanashi.ac.jp)
-or Twitter: @m_morise
\ No newline at end of file
+E-mail: mmorise [at] meiji.ac.jp
+Twitter: @m_morise
diff --git a/doc/readme_JP.txt b/doc/readme_JP.txt
index 186ba0d..c1de624 100644
--- a/doc/readme_JP.txt
+++ b/doc/readme_JP.txt
@@ -4,19 +4,6 @@
 
 WORLDは修正BSDライセンスです．
 
---------------------------------------------------------------------
-基本的な考え方：
-音声は，音高と音色により表現できるといわれます．
-最新版では，音声をF0，非周期性指標，スペクトル包絡で表現します．
-これは，Vocoderと同一の考え方です．
-
-(1) Dio() により音声の基本周波数を推定
-(1-1) 必要に応じてStoneMask() により基本周波数を補正
-(2) CheapTrick() により音声のスペクトル包絡を推定
-(3) D4C() により音声の非周期性指標を推定
-(4) 必要に応じて音高や音色の制御
-(5) Synthesis() により音声を合成
-
 --------------------------------------------------------------------
 お願い：
 WORLDを利用される場合は，商用/非商用に関わらず森勢に
@@ -25,5 +12,5 @@ WORLD
 それらの研究資金は，今後WORLDを発展させるために利用します．
 
 作者へ連絡
-mmorise [at] yamanashi.ac.jp
+mmorise [at] meiji.ac.jp
 Twitter: @m_morise 
\ No newline at end of file
diff --git a/examples/codec_test/apanalysis.cpp b/examples/codec_test/apanalysis.cpp
index 5dcbf2e..f5e752a 100644
--- a/examples/codec_test/apanalysis.cpp
+++ b/examples/codec_test/apanalysis.cpp
@@ -1,7 +1,7 @@
 //-----------------------------------------------------------------------------
 // Copyright 2017 Masanori Morise
-// Author: mmorise [at] yamanashi.ac.jp (Masanori Morise)
-// Last update: 2017/05/01
+// Author: mmorise [at] meiji.ac.jp (Masanori Morise)
+// Last update: 2021/02/15
 //
 // Summary:
 // This example estimates the aperiodicity from an audio file
diff --git a/examples/codec_test/f0analysis.cpp b/examples/codec_test/f0analysis.cpp
index 667f7f0..c6467ff 100644
--- a/examples/codec_test/f0analysis.cpp
+++ b/examples/codec_test/f0analysis.cpp
@@ -1,7 +1,7 @@
 //-----------------------------------------------------------------------------
 // Copyright 2017 Masanori Morise
-// Author: mmorise [at] yamanashi.ac.jp (Masanori Morise)
-// Last update: 2017/04/29
+// Author: mmorise [at] meiji.ac.jp (Masanori Morise)
+// Last update: 2021/02/15
 //
 // Summary:
 // This example estimates F0 from an audio file and saves it to a file.
diff --git a/examples/codec_test/readandsynthesis.cpp b/examples/codec_test/readandsynthesis.cpp
index 2ded107..e31cfe7 100644
--- a/examples/codec_test/readandsynthesis.cpp
+++ b/examples/codec_test/readandsynthesis.cpp
@@ -1,7 +1,7 @@
 //-----------------------------------------------------------------------------
 // Copyright 2017 Masanori Morise
-// Author: mmorise [at] yamanashi.ac.jp (Masanori Morise)
-// Last update: 2017/04/29
+// Author: mmorise [at] meiji.ac.jp (Masanori Morise)
+// Last update: 2021/02/15
 //
 // Summary:
 // This example reads three parameters and generates a waveform from them.
diff --git a/examples/codec_test/spanalysis.cpp b/examples/codec_test/spanalysis.cpp
index d0942be..a2a2c17 100644
--- a/examples/codec_test/spanalysis.cpp
+++ b/examples/codec_test/spanalysis.cpp
@@ -1,7 +1,7 @@
 //-----------------------------------------------------------------------------
 // Copyright 2017 Masanori Morise
-// Author: mmorise [at] yamanashi.ac.jp (Masanori Morise)
-// Last update: 2017/04/01
+// Author: mmorise [at] meiji.ac.jp (Masanori Morise)
+// Last update: 2021/02/15
 //
 // Summary:
 // This example estimates the spectral envelope from an audio file
diff --git a/examples/parameter_io/apanalysis.cpp b/examples/parameter_io/apanalysis.cpp
index f4c974c..33adbf1 100644
--- a/examples/parameter_io/apanalysis.cpp
+++ b/examples/parameter_io/apanalysis.cpp
@@ -1,7 +1,7 @@
 //-----------------------------------------------------------------------------
 // Copyright 2017 Masanori Morise
-// Author: mmorise [at] yamanashi.ac.jp (Masanori Morise)
-// Last update: 2017/03/12
+// Author: mmorise [at] meiji.ac.jp (Masanori Morise)
+// Last update: 2021/02/15
 //
 // Summary:
 // This example estimates the aperiodicity from an audio file
diff --git a/examples/parameter_io/f0analysis.cpp b/examples/parameter_io/f0analysis.cpp
index e5131e0..ef64ea8 100644
--- a/examples/parameter_io/f0analysis.cpp
+++ b/examples/parameter_io/f0analysis.cpp
@@ -1,7 +1,7 @@
 //-----------------------------------------------------------------------------
 // Copyright 2017 Masanori Morise
-// Author: mmorise [at] yamanashi.ac.jp (Masanori Morise)
-// Last update: 2017/03/12
+// Author: mmorise [at] meiji.ac.jp (Masanori Morise)
+// Last update: 2021/02/15
 //
 // Summary:
 // This example estimates F0 from an audio file and saves it to a file.
diff --git a/examples/parameter_io/readandsynthesis.cpp b/examples/parameter_io/readandsynthesis.cpp
index 4018866..f2c4450 100644
--- a/examples/parameter_io/readandsynthesis.cpp
+++ b/examples/parameter_io/readandsynthesis.cpp
@@ -1,7 +1,7 @@
 //-----------------------------------------------------------------------------
 // Copyright 2017 Masanori Morise
-// Author: mmorise [at] yamanashi.ac.jp (Masanori Morise)
-// Last update: 2017/03/12
+// Author: mmorise [at] meiji.ac.jp (Masanori Morise)
+// Last update: 2021/02/15
 //
 // Summary:
 // This example reads three parameters and generates a waveform from them.
diff --git a/examples/parameter_io/spanalysis.cpp b/examples/parameter_io/spanalysis.cpp
index 33c88f5..4deb697 100644
--- a/examples/parameter_io/spanalysis.cpp
+++ b/examples/parameter_io/spanalysis.cpp
@@ -1,7 +1,7 @@
 //-----------------------------------------------------------------------------
 // Copyright 2017 Masanori Morise
-// Author: mmorise [at] yamanashi.ac.jp (Masanori Morise)
-// Last update: 2017/03/12
+// Author: mmorise [at] meiji.ac.jp (Masanori Morise)
+// Last update: 2021/02/15
 //
 // Summary:
 // This example estimates the spectral envelope from an audio file
diff --git a/src/cheaptrick.cpp b/src/cheaptrick.cpp
index 9ce84e6..a2f9b19 100644
--- a/src/cheaptrick.cpp
+++ b/src/cheaptrick.cpp
@@ -1,7 +1,7 @@
 //-----------------------------------------------------------------------------
 // Copyright 2012 Masanori Morise
-// Author: mmorise [at] yamanashi.ac.jp (Masanori Morise)
-// Last update: 2017/02/01
+// Author: mmorise [at] meiji.ac.jp (Masanori Morise)
+// Last update: 2021/02/15
 //
 // Spectral envelope estimation on the basis of the idea of CheapTrick.
 //-----------------------------------------------------------------------------
diff --git a/src/codec.cpp b/src/codec.cpp
index af2f406..7a8da80 100644
--- a/src/codec.cpp
+++ b/src/codec.cpp
@@ -1,7 +1,7 @@
 //-----------------------------------------------------------------------------
 // Copyright 2017 Masanori Morise
-// Author: mmorise [at] yamanashi.ac.jp (Masanori Morise)
-// Last update: 2017/05/09
+// Author: mmorise [at] meiji.ac.jp (Masanori Morise)
+// Last update: 2021/02/15
 //
 // Coder/decoder functions for the spectral envelope and aperiodicity.
 //-----------------------------------------------------------------------------
diff --git a/src/common.cpp b/src/common.cpp
index 78780aa..c44ecae 100644
--- a/src/common.cpp
+++ b/src/common.cpp
@@ -1,7 +1,7 @@
 //-----------------------------------------------------------------------------
 // Copyright 2012 Masanori Morise
-// Author: mmorise [at] yamanashi.ac.jp (Masanori Morise)
-// Last update: 2017/04/29
+// Author: mmorise [at] meiji.ac.jp (Masanori Morise)
+// Last update: 2021/02/15
 //
 // common.cpp includes functions used in at least two files.
 // (1) Common functions
diff --git a/src/d4c.cpp b/src/d4c.cpp
index bcb0e6f..4e81042 100644
--- a/src/d4c.cpp
+++ b/src/d4c.cpp
@@ -1,7 +1,7 @@
 //-----------------------------------------------------------------------------
 // Copyright 2012 Masanori Morise
-// Author: mmorise [at] yamanashi.ac.jp (Masanori Morise)
-// Last update: 2017/02/01
+// Author: mmorise [at] meiji.ac.jp (Masanori Morise)
+// Last update: 2021/02/15
 //
 // Band-aperiodicity estimation on the basis of the idea of D4C.
 //-----------------------------------------------------------------------------
diff --git a/src/dio.cpp b/src/dio.cpp
index b09bb12..ec623d9 100644
--- a/src/dio.cpp
+++ b/src/dio.cpp
@@ -1,7 +1,7 @@
 //-----------------------------------------------------------------------------
 // Copyright 2012 Masanori Morise
-// Author: mmorise [at] yamanashi.ac.jp (Masanori Morise)
-// Last update: 2019/04/11
+// Author: mmorise [at] meiji.ac.jp (Masanori Morise)
+// Last update: 2021/02/15
 //
 // F0 estimation based on DIO (Distributed Inline-filter Operation).
 //-----------------------------------------------------------------------------
diff --git a/src/fft.cpp b/src/fft.cpp
index bafb20c..403db5f 100644
--- a/src/fft.cpp
+++ b/src/fft.cpp
@@ -1,7 +1,7 @@
 //-----------------------------------------------------------------------------
 // Copyright 2012 Masanori Morise
-// Author: mmorise [at] yamanashi.ac.jp (Masanori Morise)
-// Last update: 2018/01/21
+// Author: mmorise [at] meiji.ac.jp (Masanori Morise)
+// Last update: 2021/02/15
 //
 // This file represents the functions about FFT (Fast Fourier Transform)
 // implemented by Mr. Ooura, and wrapper functions implemented by M. Morise.
diff --git a/src/harvest.cpp b/src/harvest.cpp
index 795aee3..762c245 100644
--- a/src/harvest.cpp
+++ b/src/harvest.cpp
@@ -1,7 +1,7 @@
 //-----------------------------------------------------------------------------
 // Copyright 2012 Masanori Morise
-// Author: mmorise [at] yamanashi.ac.jp (Masanori Morise)
-// Last update: 2018/01/21
+// Author: mmorise [at] meiji.ac.jp (Masanori Morise)
+// Last update: 2021/02/15
 //
 // F0 estimation based on Harvest.
 //-----------------------------------------------------------------------------
diff --git a/src/matlabfunctions.cpp b/src/matlabfunctions.cpp
index 13d5def..cbe93a8 100644
--- a/src/matlabfunctions.cpp
+++ b/src/matlabfunctions.cpp
@@ -1,7 +1,7 @@
 //-----------------------------------------------------------------------------
 // Copyright 2012 Masanori Morise
-// Author: mmorise [at] yamanashi.ac.jp (Masanori Morise)
-// Last update: 2017/02/01
+// Author: mmorise [at] meiji.ac.jp (Masanori Morise)
+// Last update: 2021/02/15
 //
 // Matlab functions implemented for WORLD
 // Since these functions are implemented as the same function of Matlab,
diff --git a/src/stonemask.cpp b/src/stonemask.cpp
index 20b2cce..e46b9d2 100644
--- a/src/stonemask.cpp
+++ b/src/stonemask.cpp
@@ -1,7 +1,7 @@
 //-----------------------------------------------------------------------------
 // Copyright 2012 Masanori Morise
-// Author: mmorise [at] yamanashi.ac.jp (Masanori Morise)
-// Last update: 2017/02/01
+// Author: mmorise [at] meiji.ac.jp (Masanori Morise)
+// Last update: 2021/02/15
 //
 // F0 estimation based on instantaneous frequency.
 // This method is carried out by using the output of Dio().
diff --git a/src/synthesis.cpp b/src/synthesis.cpp
index 0854354..458d1c5 100644
--- a/src/synthesis.cpp
+++ b/src/synthesis.cpp
@@ -1,7 +1,7 @@
 //-----------------------------------------------------------------------------
 // Copyright 2012 Masanori Morise
-// Author: mmorise [at] yamanashi.ac.jp (Masanori Morise)
-// Last update: 2018/12/13
+// Author: mmorise [at] meiji.ac.jp (Masanori Morise)
+// Last update: 2021/02/15
 //
 // Voice synthesis based on f0, spectrogram and aperiodicity.
 // forward_real_fft, inverse_real_fft and minimum_phase are used to speed up.
diff --git a/src/synthesisrealtime.cpp b/src/synthesisrealtime.cpp
index 548e43c..e2ff34d 100644
--- a/src/synthesisrealtime.cpp
+++ b/src/synthesisrealtime.cpp
@@ -1,7 +1,7 @@
 //-----------------------------------------------------------------------------
 // Copyright 2012 Masanori Morise
-// Author: mmorise [at] yamanashi.ac.jp (Masanori Morise)
-// Last update: 2018/12/13
+// Author: mmorise [at] meiji.ac.jp (Masanori Morise)
+// Last update: 2021/02/15
 //
 // Voice synthesis based on f0, spectrogram and aperiodicity.
 // This is an implementation for real-time applications.
diff --git a/src/world/cheaptrick.h b/src/world/cheaptrick.h
index 4be503c..0d027a4 100644
--- a/src/world/cheaptrick.h
+++ b/src/world/cheaptrick.h
@@ -1,7 +1,7 @@
 //-----------------------------------------------------------------------------
 // Copyright 2012 Masanori Morise
-// Author: mmorise [at] yamanashi.ac.jp (Masanori Morise)
-// Last update: 2017/02/01
+// Author: mmorise [at] meiji.ac.jp (Masanori Morise)
+// Last update: 2021/02/15
 //-----------------------------------------------------------------------------
 #ifndef WORLD_CHEAPTRICK_H_
 #define WORLD_CHEAPTRICK_H_
diff --git a/src/world/codec.h b/src/world/codec.h
index b2e5ac2..7413cfa 100644
--- a/src/world/codec.h
+++ b/src/world/codec.h
@@ -1,7 +1,7 @@
 //-----------------------------------------------------------------------------
 // Copyright 2017 Masanori Morise
-// Author: mmorise [at] yamanashi.ac.jp (Masanori Morise)
-// Last update: 2017/04/29
+// Author: mmorise [at] meiji.ac.jp (Masanori Morise)
+// Last update: 2021/02/15
 //-----------------------------------------------------------------------------
 #ifndef WORLD_CODEC_H_
 #define WORLD_CODEC_H_
diff --git a/src/world/common.h b/src/world/common.h
index 9f50256..34e2519 100644
--- a/src/world/common.h
+++ b/src/world/common.h
@@ -1,7 +1,7 @@
 //-----------------------------------------------------------------------------
 // Copyright 2012 Masanori Morise
-// Author: mmorise [at] yamanashi.ac.jp (Masanori Morise)
-// Last update: 2017/04/29
+// Author: mmorise [at] meiji.ac.jp (Masanori Morise)
+// Last update: 2021/02/15
 //-----------------------------------------------------------------------------
 #ifndef WORLD_COMMON_H_
 #define WORLD_COMMON_H_
diff --git a/src/world/constantnumbers.h b/src/world/constantnumbers.h
index a36623a..bde4be8 100644
--- a/src/world/constantnumbers.h
+++ b/src/world/constantnumbers.h
@@ -1,7 +1,7 @@
 //-----------------------------------------------------------------------------
 // Copyright 2012 Masanori Morise
-// Author: mmorise [at] yamanashi.ac.jp (Masanori Morise)
-// Last update: 2019/04/11
+// Author: mmorise [at] meiji.ac.jp (Masanori Morise)
+// Last update: 2021/02/15
 //
 // This header file only defines constant numbers used for several function.
 //-----------------------------------------------------------------------------
diff --git a/src/world/d4c.h b/src/world/d4c.h
index 0e5e68b..d4878f2 100644
--- a/src/world/d4c.h
+++ b/src/world/d4c.h
@@ -1,7 +1,7 @@
 //-----------------------------------------------------------------------------
 // Copyright 2012 Masanori Morise
-// Author: mmorise [at] yamanashi.ac.jp (Masanori Morise)
-// Last update: 2017/02/01
+// Author: mmorise [at] meiji.ac.jp (Masanori Morise)
+// Last update: 2021/02/15
 //-----------------------------------------------------------------------------
 #ifndef WORLD_D4C_H_
 #define WORLD_D4C_H_
diff --git a/src/world/dio.h b/src/world/dio.h
index 87e8156..7888986 100644
--- a/src/world/dio.h
+++ b/src/world/dio.h
@@ -1,7 +1,7 @@
 //-----------------------------------------------------------------------------
 // Copyright 2012 Masanori Morise
-// Author: mmorise [at] yamanashi.ac.jp (Masanori Morise)
-// Last update: 2017/02/01
+// Author: mmorise [at] meiji.ac.jp (Masanori Morise)
+// Last update: 2021/02/15
 //-----------------------------------------------------------------------------
 #ifndef WORLD_DIO_H_
 #define WORLD_DIO_H_
diff --git a/src/world/fft.h b/src/world/fft.h
index 1fd829d..217dc95 100644
--- a/src/world/fft.h
+++ b/src/world/fft.h
@@ -1,7 +1,7 @@
 //-----------------------------------------------------------------------------
 // Copyright 2012 Masanori Morise
-// Author: mmorise [at] yamanashi.ac.jp (Masanori Morise)
-// Last update: 2017/02/01
+// Author: mmorise [at] meiji.ac.jp (Masanori Morise)
+// Last update: 2021/02/15
 //
 // These functions and variables are defined to use FFT as well as FFTW
 // Please see fft.cpp to show the detailed information
diff --git a/src/world/harvest.h b/src/world/harvest.h
index 504ac50..49b10dc 100644
--- a/src/world/harvest.h
+++ b/src/world/harvest.h
@@ -1,7 +1,7 @@
 //-----------------------------------------------------------------------------
 // Copyright 2012 Masanori Morise
-// Author: mmorise [at] yamanashi.ac.jp (Masanori Morise)
-// Last update: 2017/03/04
+// Author: mmorise [at] meiji.ac.jp (Masanori Morise)
+// Last update: 2021/02/15
 //-----------------------------------------------------------------------------
 #ifndef WORLD_HARVEST_H_
 #define WORLD_HARVEST_H_
diff --git a/src/world/matlabfunctions.h b/src/world/matlabfunctions.h
index 2bc6523..c2cc987 100644
--- a/src/world/matlabfunctions.h
+++ b/src/world/matlabfunctions.h
@@ -1,7 +1,7 @@
 //-----------------------------------------------------------------------------
 // Copyright 2012 Masanori Morise
-// Author: mmorise [at] yamanashi.ac.jp (Masanori Morise)
-// Last update: 2017/02/01
+// Author: mmorise [at] meiji.ac.jp (Masanori Morise)
+// Last update: 2021/02/15
 //-----------------------------------------------------------------------------
 #ifndef WORLD_MATLABFUNCTIONS_H_
 #define WORLD_MATLABFUNCTIONS_H_
diff --git a/src/world/stonemask.h b/src/world/stonemask.h
index de40ea7..89c8698 100644
--- a/src/world/stonemask.h
+++ b/src/world/stonemask.h
@@ -1,7 +1,7 @@
 //-----------------------------------------------------------------------------
 // Copyright 2012 Masanori Morise
-// Author: mmorise [at] yamanashi.ac.jp (Masanori Morise)
-// Last update: 2017/02/01
+// Author: mmorise [at] meiji.ac.jp (Masanori Morise)
+// Last update: 2021/02/15
 //-----------------------------------------------------------------------------
 #ifndef WORLD_STONEMASK_H_
 #define WORLD_STONEMASK_H_
diff --git a/src/world/synthesis.h b/src/world/synthesis.h
index 1a3d8e1..fbc5fd2 100644
--- a/src/world/synthesis.h
+++ b/src/world/synthesis.h
@@ -1,7 +1,7 @@
 //-----------------------------------------------------------------------------
 // Copyright 2012 Masanori Morise
-// Author: mmorise [at] yamanashi.ac.jp (Masanori Morise)
-// Last update: 2017/03/04
+// Author: mmorise [at] meiji.ac.jp (Masanori Morise)
+// Last update: 2021/02/15
 //-----------------------------------------------------------------------------
 #ifndef WORLD_SYNTHESIS_H_
 #define WORLD_SYNTHESIS_H_
diff --git a/src/world/synthesisrealtime.h b/src/world/synthesisrealtime.h
index 05c4ec1..a8c5b65 100644
--- a/src/world/synthesisrealtime.h
+++ b/src/world/synthesisrealtime.h
@@ -1,7 +1,7 @@
 //-----------------------------------------------------------------------------
 // Copyright 2012 Masanori Morise
-// Author: mmorise [at] yamanashi.ac.jp (Masanori Morise)
-// Last update: 2017/05/09
+// Author: mmorise [at] meiji.ac.jp (Masanori Morise)
+// Last update: 2021/02/15
 //-----------------------------------------------------------------------------
 #ifndef WORLD_SYNTHESISREALTIME_H_
 #define WORLD_SYNTHESISREALTIME_H_
diff --git a/styleguide.txt b/styleguide.txt
index a712369..025d248 100644
--- a/styleguide.txt
+++ b/styleguide.txt
@@ -1,8 +1,5 @@
 WORLD follows the Google C++ Style Guide
-Japanese:
-http://www.textdrop.net/google-styleguide-ja/cppguide.xml
-English:
-http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml
+https://github.com/google/styleguide
 
 However, there are several exceptions about variable names.
 Since these names are generally used in the acoustic signal processing,
diff --git a/test/ctest.c b/test/ctest.c
index 3f86739..a09b562 100644
--- a/test/ctest.c
+++ b/test/ctest.c
@@ -1,7 +1,7 @@
 //-----------------------------------------------------------------------------
 // Copyright 2012 Masanori Morise
-// Author: mmorise [at] yamanashi.ac.jp (Masanori Morise)
-// Last update: 2017/02/01
+// Author: mmorise [at] meiji.ac.jp (Masanori Morise)
+// Last update: 2021/02/15
 //
 // test.exe input.wav outout.wav f0 spec
 // input.wav  : Input file
diff --git a/test/test.cpp b/test/test.cpp
index d02dc0c..84cd5ef 100644
--- a/test/test.cpp
+++ b/test/test.cpp
@@ -1,7 +1,7 @@
 //-----------------------------------------------------------------------------
 // Copyright 2012 Masanori Morise
-// Author: mmorise [at] yamanashi.ac.jp (Masanori Morise)
-// Last update: 2020/06/09
+// Author: mmorise [at] meiji.ac.jp (Masanori Morise)
+// Last update: 2021/02/15
 //
 // test.exe input.wav outout.wav f0 spec
 // input.wav  : Input file
diff --git a/tools/audioio.cpp b/tools/audioio.cpp
index abeb327..adcef2f 100644
--- a/tools/audioio.cpp
+++ b/tools/audioio.cpp
@@ -1,7 +1,7 @@
 //-----------------------------------------------------------------------------
 // Copyright 2012 Masanori Morise
-// Author: mmorise [at] yamanashi.ac.jp (Masanori Morise)
-// Last update: 2017/03/12
+// Author: mmorise [at] meiji.ac.jp (Masanori Morise)
+// Last update: 2021/02/15
 //
 // .wav input/output functions were modified for compatibility with C language.
 // Since these functions (wavread() and wavwrite()) are roughly implemented,
diff --git a/tools/audioio.h b/tools/audioio.h
index 4896246..4fc5988 100644
--- a/tools/audioio.h
+++ b/tools/audioio.h
@@ -1,7 +1,7 @@
 //-----------------------------------------------------------------------------
 // Copyright 2012 Masanori Morise
-// Author: mmorise [at] yamanashi.ac.jp (Masanori Morise)
-// Last update: 2017/02/01
+// Author: mmorise [at] meiji.ac.jp (Masanori Morise)
+// Last update: 2021/02/15
 //-----------------------------------------------------------------------------
 #ifndef WORLD_AUDIOIO_H_
 #define WORLD_AUDIOIO_H_
diff --git a/tools/parameterio.cpp b/tools/parameterio.cpp
index 3363b42..70288e9 100644
--- a/tools/parameterio.cpp
+++ b/tools/parameterio.cpp
@@ -1,7 +1,7 @@
 //-----------------------------------------------------------------------------
 // Copyright 2017 Masanori Morise
-// Author: mmorise [at] yamanashi.ac.jp (Masanori Morise)
-// Last update: 2017/03/12
+// Author: mmorise [at] meiji.ac.jp (Masanori Morise)
+// Last update: 2021/02/15
 //
 // Save/Load functions for three speech parameters.
 //-----------------------------------------------------------------------------
diff --git a/tools/parameterio.h b/tools/parameterio.h
index ed791ef..e4c2154 100644
--- a/tools/parameterio.h
+++ b/tools/parameterio.h
@@ -1,7 +1,7 @@
 //-----------------------------------------------------------------------------
 // Copyright 2017 Masanori Morise
-// Author: mmorise [at] yamanashi.ac.jp (Masanori Morise)
-// Last update: 2017/03/12
+// Author: mmorise [at] meiji.ac.jp (Masanori Morise)
+// Last update: 2021/02/15
 //-----------------------------------------------------------------------------
 #ifndef WORLD_PARAMETERIO_H_
 #define WORLD_PARAMETERIO_H_