diff --git a/docs/extensiondev.rst b/docs/extensiondev.rst
index f93cd645..19cbd1e4 100644
--- a/docs/extensiondev.rst
+++ b/docs/extensiondev.rst
@@ -60,12 +60,18 @@ Notes
 An extension wants to:
 
 - Be automatically found if installed
+  - Either register a setuptools entry points on installation, or
+  - Require a line of configuration to activate the extension
 - Provide default config
 - Validate configuration
+  - Pass all configuration to every extension, let the extension complain on
+    anything it wants to
 - Validate presence of dependencies
   - Python packages (e.g. pyspotify)
   - Other software
-  - Other extensions (e.g. SoundCloud depends on stream backend)
+  - The presence of other extensions can be validated in the configuration
+    validation step
 - Validate that needed TCP ports are free
+- Register new GStreamer elements
 - Be asked to start running
 - Be asked to shut down