diff --git a/nvm.sh b/nvm.sh
index 4d8aac4..5dd9d81 100644
--- a/nvm.sh
+++ b/nvm.sh
@@ -1,5 +1,6 @@
 # Node Version Manager
-# Implemented as a bash function
+# Implemented as a POSIX-compliant function
+# Should work on sh, dash, bash, ksh, zsh
 # To use source this file from your bash profile
 #
 # Implemented by Tim Caswell <tim@creationix.com>