--- a/mercurial/revlogutils/sidedata.py	Mon Oct 05 10:33:52 2020 +0200
+++ b/mercurial/revlogutils/sidedata.py	Tue Sep 15 10:55:17 2020 +0200
@@ -53,6 +53,7 @@
 SD_P2COPIES = 9
 SD_FILESADDED = 10
 SD_FILESREMOVED = 11
+SD_FILES = 12
 
 # internal format constant
 SIDEDATA_HEADER = struct.Struct('>H')