diff -r 52f8b07ad2f9 -r d56a2d6f34f0 mercurial/helptext/scripting.txt
--- a/mercurial/helptext/scripting.txt	Sat Jan 18 10:37:14 2020 -0800
+++ b/mercurial/helptext/scripting.txt	Tue Jan 07 11:24:05 2020 +0100
@@ -74,6 +74,14 @@
     like the username and extensions that may be required to interface
     with a repository.
 
+HGRCSKIPREPO
+    When set, the .hg/hgrc from repositories are not read.
+
+    Note that not reading the repository's configuration can have
+    unintended consequences, as the repository config files can define
+    things like extensions that are required for access to the
+    repository.
+
 Command-line Flags
 ==================