diff --git a/js/components/MilkdropWindow/index.js b/js/components/MilkdropWindow/index.js
index 4d192eb4..899086b6 100644
--- a/js/components/MilkdropWindow/index.js
+++ b/js/components/MilkdropWindow/index.js
@@ -108,11 +108,11 @@ class MilkdropWindow extends React.Component {
     }
   }
   _handleKeyboardInput(e) {
-    if (e.which === 32) {
+    if (e.which === 32) { // spacebar
       this._nextPreset(USER_PRESET_TRANSITION_SECONDS);
-    } else if (e.which === 8) {
+    } else if (e.which === 8) { // backspace
       this._prevPreset(0);
-    } else if (e.which === 72) {
+    } else if (e.which === 72) { // H
       this._nextPreset(0);
     }
   }