Make clear that the Debian package is for desktop

README.md

@@ -28,7 +28,8 @@ Note that Chrome does not allow microphone or webcam access for sites served
 over http (except localhost), so for working VoIP you will need to serve Riot
 over https.
 
-### Installation Steps for Debian Stretch
+### Desktop Installation for Debian Stretch
+
 1. Add the repository to your sources.list using either of the following two options:
   - Directly to sources.list: `echo "deb https://riot.im/packages/debian/ stretch main" | sudo tee -a /etc/apt/sources.list`
   - As a separate entry in sources.list.d: `echo "deb https://riot.im/packages/debian/ stretch main" | sudo tee /etc/apt/sources.list.d/riot.list`