From 0b9318753ece23b5f6f3892efe84247585037a6a Mon Sep 17 00:00:00 2001
From: samreid <reids@colorado.edu>
Date: Wed, 15 Apr 2020 14:32:26 -0600
Subject: [PATCH] Document about roundoff error, see
 https://github.com/phetsims/wave-interference/issues/484

---
 js/common/view/WaveInterferenceSlider.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/js/common/view/WaveInterferenceSlider.js b/js/common/view/WaveInterferenceSlider.js
index 16143fdb..dc989392 100644
--- a/js/common/view/WaveInterferenceSlider.js
+++ b/js/common/view/WaveInterferenceSlider.js
@@ -91,6 +91,7 @@ class WaveInterferenceSlider extends HSlider {
 
           timer.setTimeout( () => {
 
+            // Also account for roundoff error, since 0.99999 seems like close enough to the end of the input.
             if ( Math.abs( value - property.value ) <= 1E-6 ) {
               sliderBoundaryClickSoundClip.play();
             }