diff --git a/peg.vim b/peg.vim
index 223d5df..b133a8b 100644
--- a/peg.vim
+++ b/peg.vim
@@ -1,4 +1,6 @@
 
+set commentstring=#\ %s
+
 syn match pegBoth /=/
 syn match pegM2U /->/
 syn match pegU2M /<-/