diff --git a/button.ino b/button.ino
index a29d8c5..f5a68cf 100644
--- a/button.ino
+++ b/button.ino
@@ -12,12 +12,15 @@ void initButton() {
 void buttonISRstate() {
   if ((millis() - lastButtonPress) > 100) {
     if (countdown < 0)
+      // TODO: enable metronome timer
       countdown = 0;
     else if (countdown == 0)
+      // TODO: restart metronome timer to align countdown
       countdown = COUNTDOWN;
     else {
       countdown = -1;
       digitalWrite(BUTTON_LED_PIN, LOW);
+      // TODO: disable metronome timer
     }
   }
 }