diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
 # ColorEchoForShell
-Make echo colorful with easier method.
+Make echo colorful with easier method. In [bash](https://www.gnu.org/software/bash/) and [zsh](http://www.zsh.org/).
 
 ## Installation