mercurial/commands.py

--- a/mercurial/commands.py	Fri Dec 18 06:19:22 2015 +0000
+++ b/mercurial/commands.py	Fri Dec 18 18:52:25 2015 +0000
@@ -3541,7 +3541,7 @@
     between those revisions. If only one revision is specified then
     that revision is compared to the working directory, and, when no
     revisions are specified, the working directory files are compared
-    to its parent.
+    to its first parent.
 
     Alternatively you can specify -c/--change with a revision to see
     the changes in that changeset relative to its first parent.