diff --git a/README.md b/README.md
index 8f6970d..7dd7c08 100644
--- a/README.md
+++ b/README.md
@@ -13,6 +13,8 @@ Here is a one-liner to try it without installing or modifying anything:
 
 ## Install it
 
+### Requirements :
+    zsh 4.3.9 or superior
 
 ### In your ~/.zshrc