diff --git a/mercurial/help/config.txt b/mercurial/help/config.txt
--- a/mercurial/help/config.txt
+++ b/mercurial/help/config.txt
@@ -2394,6 +2394,8 @@
 
 ``tweakdefaults``
 
+    Making fine adjustments in mercurial default behavior.
+
     By default Mercurial's behavior changes very little from release
     to release, but over time the recommended config settings
     shift. Enable this config to opt in to get automatic tweaks to
@@ -2401,6 +2403,12 @@
     effect if ``HGPLAIN`` is set or ``HGPLAINEXCEPT`` is set and does
     not include ``tweakdefaults``. (default: False)
 
+    It is a way to opt-in to what mercurial has decided
+    is the best default experience for it.
+
+
+
+
     It currently means::
 
       .. tweakdefaultsmarker