diff --git a/ESP-IDF_Robot/tutorial/docs/source/overview.rst b/ESP-IDF_Robot/tutorial/docs/source/overview.rst
index 3d9de6cfd..713878e50 100644
--- a/ESP-IDF_Robot/tutorial/docs/source/overview.rst
+++ b/ESP-IDF_Robot/tutorial/docs/source/overview.rst
@@ -29,7 +29,10 @@ Based on this constraint, the RC car can only move front, back, and turn/rotate
 
     **PWM** (Pulse Width Modulation) is a technique used to simulate analog voltage levels using ddiscrete igital signals. It works by rapidly switching a 
     digital pin between HIGH (on) and LOW (off) states at a fixed frequency (often, at base frequency of 5 kHz). The duty cycle—the percentage of time the signal is HIGH in one 
-    cycle—determines the effective voltage delivered to a device.
+    cycle determines the effective voltage delivered to a device.
+
+    A higher duty cycle increases the motor speed, and a lower duty cycle decreases the motor speed. This allows for fine-grained speed control 
+    without needing analog voltage regulators.
 
 A pair of PWM channels are required for defining rotation speed and direction of the DC motors on each side.
 In particular, **GPIO6** and **GPIO5** provide PWM to the left- and right- side DC motors to rotate in a **clockwise** direction.