diff --git a/en/modules/modules_driver.md b/en/modules/modules_driver.md
index c5a1269b142b..9124abd15d43 100644
--- a/en/modules/modules_driver.md
+++ b/en/modules/modules_driver.md
@@ -551,6 +551,8 @@ pca9685_pwm_out <command> [arguments...]
                  default: 64
      [-b <val>]  bus that pca9685 is connected to
                  default: 1
+     [-r <val>]  schedule rate limit
+                 default: 400
 
    stop