diff --git a/doc/not.mdwn b/doc/not.mdwn
index fe6e1b37d9..1d38b848c6 100644
--- a/doc/not.mdwn
+++ b/doc/not.mdwn
@@ -38,3 +38,9 @@
   it does not support keeping different files in different clones of the
   same repository, which git-annex does, and is an important feature for
   large-scale archiving.
+
+* git-annex is not the [Mercurial bfiles extension](http://mercurial.selenic.com/wiki/BfilesExtension).
+  Although mercurial and git have some of the same problems around large
+  files, and both try to solve them in similar ways (standin files using
+  mostly hashes of the real content).
+