diff --git a/mercurial/help/config.txt b/mercurial/help/config.txt
index ab20ee07b82df985133f4e3fa3afa2ad48516340_bWVyY3VyaWFsL2hlbHAvY29uZmlnLnR4dA==..d0a8299e7256df2d821485ca374f527207b6c3f5_bWVyY3VyaWFsL2hlbHAvY29uZmlnLnR4dA== 100644
--- a/mercurial/help/config.txt
+++ b/mercurial/help/config.txt
@@ -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``