From 7b0d9813274ab1b8e88acac4b69554efd6ed81bb Mon Sep 17 00:00:00 2001
From: Nathan Kellenicki <nathan@kellenicki.com>
Date: Mon, 24 Feb 2020 21:44:57 -0800
Subject: [PATCH] Added comment

---
 src/devices/duplotrainbasespeaker.ts | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/devices/duplotrainbasespeaker.ts b/src/devices/duplotrainbasespeaker.ts
index d2a67de..2187a6c 100644
--- a/src/devices/duplotrainbasespeaker.ts
+++ b/src/devices/duplotrainbasespeaker.ts
@@ -28,6 +28,12 @@ export class DuploTrainBaseSpeaker extends Device {
         });
     }
 
+    /**
+     * Play a built-in system tone.
+     * @method DuploTrainBaseSpeaker#playTone
+     * @param {number} tone
+     * @returns {Promise} Resolved upon successful issuance of the command.
+     */
     public playTone (tone: number) {
         this.subscribe(Mode.TONE);
         this.writeDirect(0x02, Buffer.from([tone]));