diff --git a/doc/vimux.txt b/doc/vimux.txt
index c18d0c6..785238a 100644
--- a/doc/vimux.txt
+++ b/doc/vimux.txt
@@ -188,7 +188,7 @@ Zoom requires tmux version >= 1.8
 >
 
  " Zoom the tmux runner page
- <Leader>vz :VimuxZoomRunner<CR>
+ map <Leader>vz :VimuxZoomRunner<CR>
 <
 
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