diff --git a/doc/bugs/uninit_does_not_work_in_old_repos.mdwn b/doc/bugs/uninit_does_not_work_in_old_repos.mdwn
new file mode 100644
index 0000000000..a6f7858639
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+++ b/doc/bugs/uninit_does_not_work_in_old_repos.mdwn
@@ -0,0 +1,6 @@
+As uninit does not need to actually write out any data, just remove it, it should be possible to uninit in old stores.
+
+    % git annex uninit
+    git-annex: Repository version 2 is not supported. Upgrade this repository: git-annex upgrade
+
+If the repo happens to be broken, this essentially locks in data.