--- a/hgext/fsmonitor/__init__.py	Fri Jun 19 06:15:06 2020 +0200
+++ b/hgext/fsmonitor/__init__.py	Mon Sep 14 11:32:24 2020 -0400
@@ -73,6 +73,8 @@
 
     [fsmonitor]
     warn_update_file_count = (integer)
+    # or when mercurial is built with rust support
+    warn_update_file_count_rust = (integer)
 
 If ``warn_when_unused`` is set and fsmonitor isn't enabled, a warning will
 be printed during working directory updates if this many files will be