diff -r 72d3a02c62e6 -r 9c0ba837dc65 mercurial/commands.py
--- a/mercurial/commands.py	Mon Feb 22 23:12:12 2010 -0500
+++ b/mercurial/commands.py	Tue Feb 23 06:42:10 2010 +0100
@@ -1114,8 +1114,8 @@
     revisions are specified, the working directory files are compared
     to its parent.
 
-    Alternatively you can specify -c/--change with a revision to use
-    as a baseline.
+    Alternatively you can specify -c/--change with a revision to see
+    the changes in that changeset relative to its first parent.
 
     Without the -a/--text option, diff will avoid generating diffs of
     files it detects as binary. With -a, diff will generate a diff