--- a/mercurial/revlogutils/flagutil.py	Thu Jan 06 12:46:10 2022 +0100
+++ b/mercurial/revlogutils/flagutil.py	Fri Jan 07 14:40:21 2022 +0100
@@ -32,6 +32,7 @@
 REVIDX_FLAGS_ORDER
 REVIDX_RAWTEXT_CHANGING_FLAGS
 
+# Keep this in sync with REVIDX_KNOWN_FLAGS in rust/hg-core/src/revlog/revlog.rs
 REVIDX_KNOWN_FLAGS = util.bitsfrom(REVIDX_FLAGS_ORDER)
 
 # Store flag processors (cf. 'addflagprocessor()' to register)