diff --git a/src/engine/controls/bpm/bpmtapcontrol.h b/src/engine/controls/bpm/bpmtapcontrol.h
index 5333eb37840..bcf873f8d4d 100644
--- a/src/engine/controls/bpm/bpmtapcontrol.h
+++ b/src/engine/controls/bpm/bpmtapcontrol.h
@@ -12,6 +12,9 @@
 
 class ControlPushButton;
 
+/// BpmTapControl handles the bpm_tap and tempo_tap buttons. It is related to,
+/// but separate from, BeatGridControl and BpmControl because its functionality
+/// is pretty much self-contained.
 class BpmTapControl : public EngineControl {
     Q_OBJECT