diff -r 23842c0a5000 -r 71d0fd3c2e24 mercurial/commands.py
--- a/mercurial/commands.py	Thu Dec 17 14:56:32 2015 +0000
+++ b/mercurial/commands.py	Thu Dec 17 14:57:20 2015 +0000
@@ -1187,7 +1187,7 @@
 
     Use the command :hg:`update` to switch to an existing branch. Use
     :hg:`commit --close-branch` to mark this branch head as closed.
-    When all heads of the branch are closed, the branch will be
+    When all heads of a branch are closed, the branch will be
     considered closed.
 
     Returns 0 on success.