diff --git a/include/Effect.h b/include/Effect.h
index 3d765fdc0..4dc50e8a4 100644
--- a/include/Effect.h
+++ b/include/Effect.h
@@ -161,6 +161,13 @@ public:
 
 
 protected:
+	/**
+		Effects should call this at the end of audio processing
+
+		If the setting "Keep effects running even without input" is disabled,
+		after "decay" ms of a signal below "gate", the effect is turned off
+		and won't be processed again until it receives new audio input
+	*/
 	void checkGate( double _out_sum );
 
 	virtual PluginView * instantiateView( QWidget * );