diff --git a/libraries/AP_BattMonitor/AP_BattMonitor.h b/libraries/AP_BattMonitor/AP_BattMonitor.h
index 54c2150284..311784cb54 100644
--- a/libraries/AP_BattMonitor/AP_BattMonitor.h
+++ b/libraries/AP_BattMonitor/AP_BattMonitor.h
@@ -72,6 +72,7 @@ public:
         return _singleton;
     }
 
+    // cell voltages in millivolts
     struct cells {
         uint16_t cells[AP_BATT_MONITOR_CELLS_MAX];
     };
@@ -109,7 +110,7 @@ public:
     bool healthy(uint8_t instance) const;
     bool healthy() const { return healthy(AP_BATT_PRIMARY_INSTANCE); }
 
-    /// voltage - returns battery voltage in millivolts
+    /// voltage - returns battery voltage in volts
     float voltage(uint8_t instance) const;
     float voltage() const { return voltage(AP_BATT_PRIMARY_INSTANCE); }
 
@@ -149,11 +150,11 @@ public:
     bool overpower_detected() const;
     bool overpower_detected(uint8_t instance) const;
 
-    // cell voltages
+    // cell voltages in millivolts
     bool has_cell_voltages() { return has_cell_voltages(AP_BATT_PRIMARY_INSTANCE); }
     bool has_cell_voltages(const uint8_t instance) const;
-    const cells & get_cell_voltages() const { return get_cell_voltages(AP_BATT_PRIMARY_INSTANCE); }
-    const cells & get_cell_voltages(const uint8_t instance) const;
+    const cells &get_cell_voltages() const { return get_cell_voltages(AP_BATT_PRIMARY_INSTANCE); }
+    const cells &get_cell_voltages(const uint8_t instance) const;
 
     // temperature
     bool get_temperature(float &temperature) const { return get_temperature(temperature, AP_BATT_PRIMARY_INSTANCE); }