diff -r 15d35f2ba474 -r e58e234096de mercurial/interfaces/repository.py
--- a/mercurial/interfaces/repository.py	Tue Jul 21 22:13:54 2020 +0200
+++ b/mercurial/interfaces/repository.py	Sat Aug 08 15:48:17 2020 +0530
@@ -22,6 +22,9 @@
 # of stripping them
 INTERNAL_PHASE_REQUIREMENT = b'internal-phase'
 
+# Stores manifest in Tree structure
+TREEMANIFEST_REQUIREMENT = b'treemanifest'
+
 # Local repository feature string.
 
 # Revlogs are being used for file storage.