diff -r 1b183edbb68e -r 7e3b6c4f01a2 mercurial/localrepo.py
--- a/mercurial/localrepo.py	Wed Sep 26 14:41:15 2018 -0700
+++ b/mercurial/localrepo.py	Fri Oct 19 14:59:03 2018 +0200
@@ -2922,6 +2922,7 @@
         'sharedrepo',
         'sharedrelative',
         'shareditems',
+        'shallowfilestore',
     }
 
     return {k: v for k, v in createopts.items() if k not in known}
@@ -2949,6 +2950,9 @@
        is stored as an absolute path.
     shareditems
        Set of items to share to the new repository (in addition to storage).
+    shallowfilestore
+       Indicates that storage for files should be shallow (not all ancestor
+       revisions are known).
     """
     createopts = defaultcreateopts(ui, createopts=createopts)