diff -r b7a0efb3c370 -r 13a6dd952ffe mercurial/localrepo.py
--- a/mercurial/localrepo.py	Mon Feb 04 18:14:03 2019 +0300
+++ b/mercurial/localrepo.py	Mon Feb 04 20:35:21 2019 +0300
@@ -2904,7 +2904,6 @@
 
     if scmutil.gdinitconfig(ui):
         requirements.add('generaldelta')
-        # experimental config: format.sparse-revlog
         if ui.configbool('format', 'sparse-revlog'):
             requirements.add(SPARSEREVLOG_REQUIREMENT)
     if ui.configbool('experimental', 'treemanifest'):