diff --git a/README.md b/README.md
index 4e647fd..2d5f6ff 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@ PyGraf
 ======
 
 
-Utility module to read Sddp hdr/bin result file pairs. Some [examples](#usage-samples) to convert it to 
+Utility module to read SDDP hdr/bin result file pairs. Some [examples](#usage-samples) to convert it to 
 popular formats are available.
 
 
diff --git a/csv_sample.py b/csv_sample.py
index 9fa7c82..e21ca47 100644
--- a/csv_sample.py
+++ b/csv_sample.py
@@ -1,4 +1,4 @@
-# Converts a Sddp result binary file to Comma Delimited Values (CSV) file.
+# Converts a SDDP result binary file to Comma Delimited Values (CSV) file.
 from __future__ import print_function
 import psr.graf
 
@@ -37,10 +37,10 @@ def graf_to_csv(graf_file_path, csv_path, **csv_kwargs):
     # Read file name from command line arguments
     # - or use sample data if not provided.
     parser = argparse.ArgumentParser(
-        description='Converts a Sddp result binary file to Comma '
+        description='Converts a SDDP result binary file to Comma '
                     'Delimited Values (CSV) file.')
     parser.add_argument('sddp_file', type=str, nargs='?',
-                        help='Sddp result binary file', default=None)
+                        help='SDDP result binary file', default=None)
     parser.add_argument('csv_file', type=str, nargs='?',
                         help='Output CSV file', default=None)
     args = parser.parse_args()
diff --git a/dataframes_sample.py b/dataframes_sample.py
index 098b919..03d7d5f 100644
--- a/dataframes_sample.py
+++ b/dataframes_sample.py
@@ -1,4 +1,4 @@
-# Converts a Sddp result binary file into pandas.DataFrame.
+# Converts a SDDP result binary file into pandas.DataFrame.
 from __future__ import print_function
 import psr.graf
 import pandas
diff --git a/parquet_sample.py b/parquet_sample.py
index fce1cc3..d27d9fe 100644
--- a/parquet_sample.py
+++ b/parquet_sample.py
@@ -1,4 +1,4 @@
-# Converts a Sddp result binary file to Apache Parquet file format.
+# Converts a SDDP result binary file to Apache Parquet file format.
 from __future__ import print_function
 import psr.graf
 
@@ -94,10 +94,10 @@ def parquet_to_csv(parquet_file_path, csv_file_path):
     # Read file name from command line arguments
     # - or use sample data if not provided.
     parser = argparse.ArgumentParser(
-        description='Converts a Sddp result binary file to Apache Parquet '
+        description='Converts a SDDP result binary file to Apache Parquet '
                     'file format.')
     parser.add_argument('sddp_file', type=str, nargs='?',
-                        help='Sddp result binary file', default=None)
+                        help='SDDP result binary file', default=None)
     parser.add_argument('parquet_file', type=str, nargs='?',
                         help='Output Parquet file', default=None)
     args = parser.parse_args()