diff --git a/README.md b/README.md
index da086dd..c0b5b08 100644
--- a/README.md
+++ b/README.md
@@ -83,10 +83,10 @@ CONFIGURATION EXPLANATION
 
 * increase the size of history:
     
-``
+```Shell
      export HISTFILESIZE=10000
      export HISTSIZE=${HISTFILESIZE}
-``
+```
  
   Variables defined above increase the number of history items and history file size
   (default value is 500).