diff --git a/docker/README.md b/docker/README.md
index 3d028e270b..bcaa871b81 100644
--- a/docker/README.md
+++ b/docker/README.md
@@ -1,2 +1,5 @@
 See https://alaveteli.org/docs/installing/docker/ for a guide to installing
 Alaveteli via Docker.
+
+**This Docker environment is only intended for development environments at
+present.**