diff --git a/src/drivers/px4fmu/px4fmu_params.c b/src/drivers/px4fmu/px4fmu_params.c
index 2f5461a233..53328fe7d5 100644
--- a/src/drivers/px4fmu/px4fmu_params.c
+++ b/src/drivers/px4fmu/px4fmu_params.c
@@ -49,6 +49,9 @@
  *
  * @reboot_required true
  *
+ * @unit enum
+ * @value 0 default
+ * @value 1 invert
  * @min 0
  * @max 1
  * @group PWM Outputs
@@ -62,6 +65,9 @@ PARAM_DEFINE_INT32(PWM_AUX_REV1, 0);
  *
  * @reboot_required true
  *
+ * @unit enum
+ * @value 0 default
+ * @value 1 invert
  * @min 0
  * @max 1
  * @group PWM Outputs
@@ -75,6 +81,9 @@ PARAM_DEFINE_INT32(PWM_AUX_REV2, 0);
  *
  * @reboot_required true
  *
+ * @unit enum
+ * @value 0 default
+ * @value 1 invert
  * @min 0
  * @max 1
  * @group PWM Outputs
@@ -88,6 +97,9 @@ PARAM_DEFINE_INT32(PWM_AUX_REV3, 0);
  *
  * @reboot_required true
  *
+ * @unit enum
+ * @value 0 default
+ * @value 1 invert
  * @min 0
  * @max 1
  * @group PWM Outputs
@@ -101,6 +113,9 @@ PARAM_DEFINE_INT32(PWM_AUX_REV4, 0);
  *
  * @reboot_required true
  *
+ * @unit enum
+ * @value 0 default
+ * @value 1 invert
  * @min 0
  * @max 1
  * @group PWM Outputs
@@ -114,6 +129,9 @@ PARAM_DEFINE_INT32(PWM_AUX_REV5, 0);
  *
  * @reboot_required true
  *
+ * @unit enum
+ * @value 0 default
+ * @value 1 invert
  * @min 0
  * @max 1
  * @group PWM Outputs