diff -r e70d6dbde713 -r 37d70ba1d9d1 mercurial/commands.py
--- a/mercurial/commands.py	Sun May 28 11:48:18 2017 -0700
+++ b/mercurial/commands.py	Sun May 28 11:50:43 2017 -0700
@@ -1326,6 +1326,8 @@
 
 
     contentopts = {'cg.version': cgversion}
+    if repo.ui.configbool('experimental', 'evolution.bundle-obsmarker', False):
+        contentopts['obsolescence'] = True
     bundle2.writenewbundle(ui, repo, 'bundle', fname, bversion, outgoing,
                            contentopts, compression=bcompression,
                            compopts=compopts)