diff --git a/libraries/AP_Mount/AP_Mount_Backend.cpp b/libraries/AP_Mount/AP_Mount_Backend.cpp
index 07126ccee9..dec5d0fc1c 100644
--- a/libraries/AP_Mount/AP_Mount_Backend.cpp
+++ b/libraries/AP_Mount/AP_Mount_Backend.cpp
@@ -194,7 +194,7 @@ bool AP_Mount_Backend::calc_angle_to_sysid_target(Vector3f& angles_to_target_rad
                                   relative_pan);
 }
 
-// calc_angle_to_location - calculates the earth-frame roll, tilt and pan angles (and radians) to point at the given target
+// calc_angle_to_location - calculates the earth-frame roll, tilt and pan angles (in radians) to point at the given target
 bool AP_Mount_Backend::calc_angle_to_location(const struct Location &target, Vector3f& angles_to_target_rad, bool calc_tilt, bool calc_pan, bool relative_pan) const
 {
     Location current_loc;
diff --git a/libraries/AP_Mount/AP_Mount_Backend.h b/libraries/AP_Mount/AP_Mount_Backend.h
index 7ccdcca64f..821bf56871 100644
--- a/libraries/AP_Mount/AP_Mount_Backend.h
+++ b/libraries/AP_Mount/AP_Mount_Backend.h
@@ -94,7 +94,7 @@ protected:
     float angle_input_rad(const RC_Channel* rc, int16_t angle_min, int16_t angle_max);
 
     // calc_angle_to_location - calculates the earth-frame roll, tilt
-    // and pan angles (and radians) to point at the given target
+    // and pan angles (in radians) to point at the given target
     bool calc_angle_to_location(const struct Location &target,
                                 Vector3f& angles_to_target_rad,
                                 bool calc_tilt,
@@ -102,7 +102,7 @@ protected:
                                 bool relative_pan = true) const WARN_IF_UNUSED;
 
     // calc_angle_to_roi_target - calculates the earth-frame roll, tilt
-    // and pan angles (and radians) to point at the ROI-target (as set
+    // and pan angles (in radians) to point at the ROI-target (as set
     // by various mavlink messages)
     bool calc_angle_to_roi_target(Vector3f& angles_to_target_rad,
                                   bool calc_tilt,
@@ -110,7 +110,7 @@ protected:
                                   bool relative_pan = true) const WARN_IF_UNUSED;
 
     // calc_angle_to_sysid_target - calculates the earth-frame roll, tilt
-    // and pan angles (and radians) to point at the sysid-target (as set
+    // and pan angles (in radians) to point at the sysid-target (as set
     // by various mavlink messages)
     bool calc_angle_to_sysid_target(Vector3f& angles_to_target_rad,
                                     bool calc_tilt,