diff --git a/README.md b/README.md
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@@ -1,6 +1,8 @@
 Plum
 ====
 
+**WARNING**: This is a work in progress and probably won't work yet. Feedback welcome.
+
 Plum is tool for defining and running apps with Docker. It uses a simple, version-controllable YAML configuration file that looks something like this:
 
 ```yaml