diff --git a/Video-Stream.md b/Video-Stream.md
index 907a652..2554db4 100644
--- a/Video-Stream.md
+++ b/Video-Stream.md
@@ -1,5 +1,9 @@
 Guidance for building an app against the `-apistream` video stream: which format to use, what the parameters mean, and what the client is responsible for. The endpoint list and query parameters are in the main README.
 
+## Reference Implementation 
+
+See https://github.com/spice2x/substream which is a web app that performs streaming & uses WebSocket to send back touch input.
+
 ## Connecting
 
 Open a plain HTTP GET and read the body until you close it or the server does. There is no handshake and no authentication.