diff --git a/contrib/zk.vim b/contrib/zk.vim
index e9feec63b..9b94ce3e1 100644
--- a/contrib/zk.vim
+++ b/contrib/zk.vim
@@ -1,5 +1,7 @@
 " Syntax highlighting for zkas scripts.
 " Symlink into ~/.vim/syntax/zk.vim
+" Add to your vim init file:
+"   au BufNewFile,BufRead,BufReadPost *.zk set syntax=zk
 
 if exists("b:current_syntax")
     finish