diff --git a/libraries/AP_Motors/AP_MotorsMulticopter.cpp b/libraries/AP_Motors/AP_MotorsMulticopter.cpp
index 43fdbd0370..e084c62434 100644
--- a/libraries/AP_Motors/AP_MotorsMulticopter.cpp
+++ b/libraries/AP_Motors/AP_MotorsMulticopter.cpp
@@ -379,6 +379,7 @@ void AP_MotorsMulticopter::update_throttle_hover(float dt)
     }
 }
 
+// run spool logic
 void AP_MotorsMulticopter::output_logic()
 {
     // force desired and current spool mode if disarmed or not interlocked
diff --git a/libraries/AP_Motors/AP_MotorsMulticopter.h b/libraries/AP_Motors/AP_MotorsMulticopter.h
index 064a28d2e8..15dd97811d 100644
--- a/libraries/AP_Motors/AP_MotorsMulticopter.h
+++ b/libraries/AP_Motors/AP_MotorsMulticopter.h
@@ -75,7 +75,7 @@ public:
     // get_batt_resistance - get battery resistance approximation - for logging purposes only
     float               get_batt_resistance() const { return _batt_resistance; }
 
-    // get_throttle_limit - throttle limit ratio - for logging purposes only
+    // get throttle limit imposed by battery current limiting.  This is a number from 0 ~ 1 where 0 means hover throttle, 1 means the hover throttle
     float               get_throttle_limit() const { return _throttle_limit; }
 
     // returns maximum thrust in the range 0 to 1