diff --git a/Readme.md b/Readme.md
index d9fb639fe2e8485a2f120072dc04d0cb17092c96..7d7674a1d88feb5379921b4de8dca93f752d814e 100644
--- a/Readme.md
+++ b/Readme.md
@@ -5,6 +5,8 @@ This is the official [Heroku buildpack](http://devcenter.heroku.com/articles/bui
 
 Recommended web frameworks include **Django** and **Flask**. The recommended webserver is **Gunicorn**. There are no restrictions around what software can be used (as long as it's pip-installable). Web processes must bind to `$PORT`, and only the HTTP protocol is permitted for incoming connections.
 
+Some Python packages with obscure C dependencies (e.g scipy) are not yet supported. 
+
 See it in Action
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