Update limitations about Docker Spaces

README.md

@@ -42,5 +42,14 @@ Go to your Space's settings and click on "Enable dev mode".
 
 ## Limitations
 
-The dev mode is currently only available for Gradio and Streamlit Spaces.
+The dev mode is currently not available for static Spaces.
+
+### Docker Spaces
+
+Dev mode is supported for Docker Spaces. However, your Space needs to comply with the following rules for the Dev mode to work properly:
+
+- The operating system must be debian-based (Ubuntu, Fedora for ex).
+- The Dockerfile must contain a `CMD` instruction for startup.
+
+Checkout [Docker's documentation](https://docs.docker.com/reference/dockerfile/#cmd) about the `CMD` instruction for more details.