diff --git a/mercurial/localrepo.py b/mercurial/localrepo.py
--- a/mercurial/localrepo.py
+++ b/mercurial/localrepo.py
@@ -1274,11 +1274,6 @@
     used.
     """
 
-    # obsolete experimental requirements:
-    #  - manifestv2: An experimental new manifest format that allowed
-    #    for stem compression of long paths. Experiment ended up not
-    #    being successful (repository sizes went up due to worse delta
-    #    chains), and the code was deleted in 4.6.
     supportedformats = {
         requirementsmod.REVLOGV1_REQUIREMENT,
         requirementsmod.GENERALDELTA_REQUIREMENT,
diff --git a/mercurial/requirements.py b/mercurial/requirements.py
--- a/mercurial/requirements.py
+++ b/mercurial/requirements.py
@@ -7,6 +7,12 @@
 
 from __future__ import absolute_import
 
+# obsolete experimental requirements:
+#  - manifestv2: An experimental new manifest format that allowed
+#    for stem compression of long paths. Experiment ended up not
+#    being successful (repository sizes went up due to worse delta
+#    chains), and the code was deleted in 4.6.
+
 GENERALDELTA_REQUIREMENT = b'generaldelta'
 DOTENCODE_REQUIREMENT = b'dotencode'
 STORE_REQUIREMENT = b'store'