Update help and README

README.md

@@ -92,3 +92,16 @@ change its source stream URL to this file. The already generated files are store
 directory so there is no need to resynthesize frequently-used message which reduces
 the overall time needed to complete the request. You are still able to invalidate
 this cache via application settings.
+
+
+## The `/gong.wav` endpoint
+```
+GET /gong.wav
+```
+*Returns:* `200 OK` with gong wave file (`Content-Type: audio/x-wav`)
+
+This endpoint is designed for serving gong wave to Sonos devices
+and – similar to `/sonos/{fileName}` – is not intended
+to be used directly by you. If gong is enabled in the settings,
+Sonos is requested to change its source stream URL to a gong
+file prior to the actual announcement being served by `/sonos/{fileName}` endpoint.

app/src/main/assets/help/help.html

@@ -111,5 +111,21 @@ GET /sonos/{fileName}
     the overall time needed to complete the request. You are still able to invalidate
     this cache via application settings.
 </p>
+
+<h2>The <code>/gong.wav</code> endpoint</h2>
+<pre>
+GET /gong.wav
+</pre>
+<p>
+    <b>Returns: </b> <code>200 OK</code>
+    with gong wave file (<code>Content-Type: audio/x-wav</code>)
+</p>
+<p>
+    This endpoint is designed for serving gong wave file
+    to Sonos devices and &ndash; similar to <code>/sonos/{fileName}</code> &ndash;
+    is not intended to be used directly by you. If gong is enabled in the settings,
+    Sonos is requested to change its source stream URL to a gong file prior to
+    the actual announcement being served by <code>/sonos/{fileName}</code> endpoint.
+</p>
 </body>
 </html>