--- a/mercurial/help/config.txt	Fri Sep 04 21:12:07 2015 +0800
+++ b/mercurial/help/config.txt	Wed Sep 02 02:03:22 2015 -0400
@@ -211,7 +211,7 @@
 
 Aliases allow you to define your own commands in terms of other
 commands (or aliases), optionally including arguments. Positional
-arguments in the form of ``$1``, ``$2``, etc in the alias definition
+arguments in the form of ``$1``, ``$2``, etc. in the alias definition
 are expanded by Mercurial before execution. Positional arguments not
 already used by ``$N`` in the definition are put at the end of the
 command to be executed.