diff -r 3c65cdcf3ba6 -r afb2ed5b37a2 mercurial/revset.py
--- a/mercurial/revset.py	Fri May 13 19:46:36 2011 -0500
+++ b/mercurial/revset.py	Wed May 18 09:15:18 2011 +0200
@@ -428,7 +428,8 @@
 
 def contains(repo, subset, x):
     """``contains(pattern)``
-    Revision contains pattern.
+    Revision contains a file matching pattern. See :hg:`help patterns`
+    for information about file patterns.
     """
     # i18n: "contains" is a keyword
     pat = getstring(x, _("contains requires a pattern"))