diff -r 913485776542 -r fd55a9eb1507 mercurial/configitems.py
--- a/mercurial/configitems.py	Thu Jan 28 15:28:57 2021 +0100
+++ b/mercurial/configitems.py	Wed Jan 20 21:14:06 2021 +0100
@@ -1299,6 +1299,12 @@
 )
 coreconfigitem(
     b'format',
+    b'exp-revlogv2.2',
+    default=False,
+    experimental=True,
+)
+coreconfigitem(
+    b'format',
     b'exp-use-copies-side-data-changeset',
     default=False,
     experimental=True,