--- a/mercurial/configitems.py	Tue Aug 16 19:04:23 2022 +0200
+++ b/mercurial/configitems.py	Tue Aug 16 20:09:31 2022 +0200
@@ -1425,9 +1425,12 @@
     default=False,
     experimental=True,
 )
+
+# Moving this on by default means we are confident about the scaling of phases.
+# This is not garanteed to be the case at the time this message is written.
 coreconfigitem(
     b'format',
-    b'internal-phase',
+    b'use-internal-phase',
     default=False,
     experimental=True,
 )