diff --git a/drivers/include/periph/pwm.h b/drivers/include/periph/pwm.h
index 15b7792b3e93da75b16500d1e432bd4783891e55..a64eebcfa050a627664a35214c585209014d6ef0 100644
--- a/drivers/include/periph/pwm.h
+++ b/drivers/include/periph/pwm.h
@@ -76,7 +76,7 @@ typedef enum {
  * @param[in] frequency     the PWM frequency in Hz
  * @param[in] resolution    the PWM resolution
  *
- * @return                  0 on success
+ * @return                  Actual PWM frequency on success
  * @return                  -1 on mode not applicable
  * @return                  -2 on frequency and resolution not applicable
  */