diff -r e7bb5fc4570c -r e333d27514b0 hgext/lfs/__init__.py
--- a/hgext/lfs/__init__.py	Thu Dec 14 13:04:08 2017 -0500
+++ b/hgext/lfs/__init__.py	Tue Dec 12 15:16:02 2017 -0500
@@ -64,6 +64,10 @@
 configtable = {}
 configitem = registrar.configitem(configtable)
 
+configitem('experimental', 'lfs.user-agent',
+    default=None,
+)
+
 configitem('lfs', 'url',
     default=configitem.dynamicdefault,
 )