diff --git a/sw/airborne/math/pprz_geodetic_double.h b/sw/airborne/math/pprz_geodetic_double.h
index 69df6f8e446..5903506386d 100644
--- a/sw/airborne/math/pprz_geodetic_double.h
+++ b/sw/airborne/math/pprz_geodetic_double.h
@@ -48,8 +48,6 @@ struct EcefCoor_d {
 
 /**
  * @brief vector in Latitude, Longitude and Altitude
- * @details Units lat,lon: radians
- * Unit alt: meters above MSL
  */
 struct LlaCoor_d {
   double lon; ///< in radians
diff --git a/sw/airborne/math/pprz_geodetic_float.h b/sw/airborne/math/pprz_geodetic_float.h
index 9d021880adb..7d964bf742a 100644
--- a/sw/airborne/math/pprz_geodetic_float.h
+++ b/sw/airborne/math/pprz_geodetic_float.h
@@ -48,8 +48,6 @@ struct EcefCoor_f {
 
 /**
  * @brief vector in Latitude, Longitude and Altitude
- * @details Units lat,lon: radians
- * Unit alt: meters above MSL
  */
 struct LlaCoor_f {
   float lon; ///< in radians
diff --git a/sw/airborne/math/pprz_geodetic_int.h b/sw/airborne/math/pprz_geodetic_int.h
index 9d95d52319f..de67620618e 100644
--- a/sw/airborne/math/pprz_geodetic_int.h
+++ b/sw/airborne/math/pprz_geodetic_int.h
@@ -50,8 +50,6 @@ struct EcefCoor_i {
 
 /**
  * @brief vector in Latitude, Longitude and Altitude
- * @details Units lat,lon: radians*1e7
- * Unit alt: centimeters above MSL
  */
 struct LlaCoor_i {
   int32_t lon; ///< in radians*1e7
diff --git a/sw/airborne/state.h b/sw/airborne/state.h
index 58fa27f233b..2089bc5ee1e 100644
--- a/sw/airborne/state.h
+++ b/sw/airborne/state.h
@@ -148,7 +148,7 @@ struct State {
   /**
    * Position in Latitude, Longitude and Altitude.
    * Units lat,lon: radians*1e7
-   * Units alt: centimeters above MSL
+   * Units alt: milimeters above reference ellipsoid
    */
   struct LlaCoor_i lla_pos_i;
 
@@ -196,7 +196,7 @@ struct State {
   /**
    * Position in Latitude, Longitude and Altitude.
    * Units lat,lon: radians
-   * Units alt: meters above MSL
+   * Units alt: meters above reference ellipsoid
    */
   struct LlaCoor_f lla_pos_f;