Update readme.markdown

johnantoni · Jan 24, 2013 · 2a1b612 · 2a1b612
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diff --git a/readme.markdown b/readme.markdown
@@ -4,6 +4,12 @@ customized janus config for vim & macvim
 
 ## to install:
 
+### requirements
+
+    sudo apt-get install ack-grep
+
+### ready to install
+
 first install janus: 
 
     cd ~