diff --git a/tools/docker-warning.sh b/tools/docker-warning.sh
new file mode 100755
index 000000000..e4f5f40ee
--- /dev/null
+++ b/tools/docker-warning.sh
@@ -0,0 +1,4 @@
+#!/bin/sh -e
+echo "Warning: This Docker image will soon be switching to Alpine Linux." >&2
+echo "You can switch now using the certbot/certbot repo on Docker Hub." >&2
+exec /opt/certbot/venv/bin/certbot $@