--- a/mercurial/help/config.txt	Wed Jan 06 12:55:56 2016 -0800
+++ b/mercurial/help/config.txt	Tue Jan 12 13:43:41 2016 -0800
@@ -1323,6 +1323,13 @@
 ``assume-tty``
     If true, ALWAYS show a progress bar, unless disable is given.
 
+``rebase``
+----------
+
+``allowdivergence``
+    Default to False, when True allow creating divergence when performing
+    rebase of obsolete changesets.
+
 ``revsetalias``
 ---------------