diff --git a/ESP-IDF_Robot/tutorial/docs/source/overview.rst b/ESP-IDF_Robot/tutorial/docs/source/overview.rst
index 08cc7ed02..3d9de6cfd 100644
--- a/ESP-IDF_Robot/tutorial/docs/source/overview.rst
+++ b/ESP-IDF_Robot/tutorial/docs/source/overview.rst
@@ -27,8 +27,8 @@ Based on this constraint, the RC car can only move front, back, and turn/rotate
 
 .. admonition:: What is PWM?
 
-    **PWM** (Pulse Width Modulation) is a technique used to simulate analog voltage levels using digital signals. It works by rapidly switching a 
-    digital pin between HIGH (on) and LOW (off) states at a fixed frequency (often, 5 kHz). The duty cycle—the percentage of time the signal is HIGH in one 
+    **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.
 
 A pair of PWM channels are required for defining rotation speed and direction of the DC motors on each side.