diff --git a/doc/todo/immutable_annexed_files.mdwn b/doc/todo/immutable_annexed_files.mdwn
index 8f19f4f744..e5207dc163 100644
--- a/doc/todo/immutable_annexed_files.mdwn
+++ b/doc/todo/immutable_annexed_files.mdwn
@@ -1,3 +1,6 @@
 > josh: Do you do anything in git-annex to try to make the files immutable?
 > For instance, removing write permission, or even chattr?
 > joey: I don't, but that's a very good idea
+> josh: Oh, I just thought of another slightly crazy but handy idea.
+> josh: I'd hate to run into a program which somehow followed the symlink and then did an unlink to replace the file.
+> josh: To break that, you could create a new directory under annex's internal directory for each file, and make the directory have no write permission.