diff --git a/watch-faces/complication/moon_phase_face.h b/watch-faces/complication/moon_phase_face.h
index b0209829..2a32ed6b 100644
--- a/watch-faces/complication/moon_phase_face.h
+++ b/watch-faces/complication/moon_phase_face.h
@@ -47,6 +47,9 @@
  * each button press, and both the text and the graphical representation will
  * display the moon phase for that day. Try pressing the Alarm button 27 times
  * now, just to visualize what the moon will look like over the next month.
+ * Pressing the Light button will move back in time.
+ * 
+ * Holding the Light button will illuminate the display.
  */
 
 #include "movement.h"
diff --git a/watch-faces/sensor/activity_logging_face.h b/watch-faces/sensor/activity_logging_face.h
index 6c5b74fb..f4f58b6e 100644
--- a/watch-faces/sensor/activity_logging_face.h
+++ b/watch-faces/sensor/activity_logging_face.h
@@ -40,6 +40,8 @@
  *
  * A short press of the Alarm button moves backwards in the data log, showing yesterday's active minutes,
  * then the day before, etc. going back 14 days.
+ * A short press of the Light button moves forward in the data log, looping around if we're on the most-recent day.
+ * Holding the Light button will illuminate the display.
  *
  */