diff -r 3e102a8dd52c -r e8c8d81eb864 mercurial/commands.py
--- a/mercurial/commands.py	Fri Jun 16 16:56:16 2017 -0700
+++ b/mercurial/commands.py	Thu Jun 22 10:10:02 2017 -0700
@@ -1230,6 +1230,8 @@
     contentopts = {'cg.version': cgversion}
     if repo.ui.configbool('experimental', 'evolution.bundle-obsmarker', False):
         contentopts['obsolescence'] = True
+    if repo.ui.configbool('experimental', 'bundle-phases', False):
+        contentopts['phases'] = True
     bundle2.writenewbundle(ui, repo, 'bundle', fname, bversion, outgoing,
                            contentopts, compression=bcompression,
                            compopts=compopts)