--- a/mercurial/help/config.txt	Mon Aug 06 14:06:19 2018 +0300
+++ b/mercurial/help/config.txt	Tue Sep 04 20:54:41 2018 -0400
@@ -2354,7 +2354,7 @@
     to release, but over time the recommended config settings
     shift. Enable this config to opt in to get automatic tweaks to
     Mercurial's behavior over time. This config setting will have no
-    effet if ``HGPLAIN` is set or ``HGPLAINEXCEPT`` is set and does
+    effect if ``HGPLAIN` is set or ``HGPLAINEXCEPT`` is set and does
     not include ``tweakdefaults``. (default: False)
 
 ``username``