diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
index e93b0b020..53c2bbdf7 100644
--- a/.github/workflows/ubuntu.yml
+++ b/.github/workflows/ubuntu.yml
@@ -11,8 +11,26 @@ jobs:
     steps:
       - uses: actions/checkout@v1    
       - name: build 7za
-        run: make 7za
-        
+        run: |
+             make 7za
+             cd ./bin
+             7za a ta.7z ../CPP
+             7za x ta.7z
+             echo "compare file"
+             diff -r ../CPP ./CPP
+             echo "delete tmp file"
+             rm -rf ./ta.7z ./CPP
+             cd ..
+             
       - name: build 7z
-        run: make 7z
-        
\ No newline at end of file
+        run: |
+             make 7z
+             cd ./bin
+             7z a t.7z ../CPP
+             7z x t.7z
+             echo "compare file"
+             diff -r ../CPP ./CPP
+             echo "delete tmp file"
+             rm -rf ./t.7z ./CPP
+             cd ..
+        
diff --git a/CPP/7zip/Compress/ShrinkDecoder.cpp b/CPP/7zip/Compress/ShrinkDecoder.cpp
index ec2ed54f3..f5fbeae46 100644
--- a/CPP/7zip/Compress/ShrinkDecoder.cpp
+++ b/CPP/7zip/Compress/ShrinkDecoder.cpp
@@ -121,12 +121,12 @@ HRESULT CDecoder::CodeReal(ISequentialInStream *inStream, ISequentialOutStream *
     {
       _stack[i++] = _suffixes[cur];
       cur = _parents[cur];
-	  if (cur >= kNumItems || i >= kNumItems)
- 	  	break;
+      if (cur >= kNumItems || i >= kNumItems)
+        break;
     }
 	
-  	if (cur >= kNumItems || i >= kNumItems)
-	  break;
+    if (cur >= kNumItems || i >= kNumItems)
+      break;
     
     _stack[i++] = (Byte)cur;
     lastChar2 = (Byte)cur;
diff --git a/README.md b/README.md
index f4119a542..09b53db93 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
 
-# README
+# A new p7zip fork with additional codecs and improvements (forked from https://sourceforge.net/projects/p7zip/).
 
 This is the Github Page of [p7-Zip] with support of additional Codecs. The library used therefore is located here: [Multithreading Library](https://github.com/mcmilk/zstdmt)