--- a/mercurial/chgserver.py	Sat Feb 01 12:57:32 2020 +0900
+++ b/mercurial/chgserver.py	Thu Feb 13 10:12:12 2020 -0800
@@ -83,6 +83,7 @@
     b'eol',  # uses setconfig('eol', ...)
     b'extdiff',  # uisetup will register new commands
     b'extensions',
+    b'schemes',  # extsetup will update global hg.schemes
 ]
 
 _configsectionitems = [