--- a/mercurial/configitems.py	Tue Jan 12 09:11:15 2021 -0800
+++ b/mercurial/configitems.py	Sat Jan 16 00:21:54 2021 +0100
@@ -700,6 +700,8 @@
     b'debug.peer-request',
     default=False,
 )
+# If discovery.randomize is False, random sampling during discovery are
+# deterministic. It is meant for integration tests.
 coreconfigitem(
     b'devel',
     b'discovery.randomize',