diff --git a/doc/todo/Error_when_using_6.20180913_with_6.20170101-1+deb9u2.mdwn b/doc/todo/Error_when_using_6.20180913_with_6.20170101-1+deb9u2.mdwn
new file mode 100644
index 0000000000..06007ce5dc
--- /dev/null
+++ b/doc/todo/Error_when_using_6.20180913_with_6.20170101-1+deb9u2.mdwn
@@ -0,0 +1,7 @@
+[A Debian user reports](https://bugs.debian.org/909023) that 6.20180913 cannot be used with a server running the version of git-annex in Debian stretch.  The error is:
+
+    fd:23: hClose: resource vanished (Broken pipe)
+
+Presumably this sudden lack of backwards incompatibility is intentional.
+
+--spwhitton