diff --git a/config.js b/config.js
index 0ffa96e3b36e..a0656bd8793f 100644
--- a/config.js
+++ b/config.js
@@ -54,6 +54,13 @@ var config = {
         // Disables the auto-play behavior of *all* newly created video element.
         // This is useful when the client runs on a host with limited resources.
         // noAutoPlayVideo: false
+
+        // Enable / disable 500 Kbps bitrate cap on desktop tracks. When enabled,
+        // simulcast is turned off for the desktop share. If presenter is turned
+        // on while screensharing is in progress, the max bitrate is automatically
+        // adjusted to 2.5 Mbps. This takes a value between 0 and 1 which determines
+        // the probability for this to be enabled.
+        // capScreenshareBitrate: 1 // 0 to disable
     },
 
     // Disables ICE/UDP by filtering out local and remote UDP candidates in