diff --git a/mercurial/help/config.txt b/mercurial/help/config.txt
--- a/mercurial/help/config.txt
+++ b/mercurial/help/config.txt
@@ -187,7 +187,7 @@ command to be executed.
 
 Alias definitions consist of lines of the form::
 
-    <alias> = <command> [<argument]...
+    <alias> = <command> [<argument>]...
 
 For example, this definition::