diff --git a/README.md b/README.md
index 5ae947d..a77a238 100644
--- a/README.md
+++ b/README.md
@@ -19,3 +19,9 @@ Then either run `sudo tupper` or wait for the daily cron scheduler to kick in.
 
 `dpkg-deb --build . tupper_0.1_any.deb`
 
+## TODO / Known pitfalls
+
+- The Borg backup destination (thus, the contents of the SSHFS directory) must be `borg init`ed; tupper won't do that (and probably shouldn't anyway)
+- If `tupper` fails with `timeout waiting for prompt`, you may need to validate and accept the SSH host key: `ssh-keyscan yournas.local | sudo tee --append /root/.ssh/known_hosts`
+
+