diff --git a/ESP-IDF_Robot_RC/main/espnow_example_main.c b/ESP-IDF_Robot_RC/main/espnow_example_main.c
index 812e42ab8..484abd9a4 100755
--- a/ESP-IDF_Robot_RC/main/espnow_example_main.c
+++ b/ESP-IDF_Robot_RC/main/espnow_example_main.c
@@ -32,7 +32,7 @@ typedef struct {
     int         x_axis;             // Joystick x-position
     int         y_axis;             // Joystick y-position
     bool        nav_bttn;           // Joystick push button
-    uint8_t     motor1_rpm_pcm;     // PWMs for 4 motors
+    uint8_t     motor1_rpm_pcm;     // PWMs for 4 DC motors
     uint8_t     motor2_rpm_pcm;
     uint8_t     motor3_rpm_pcm;
     uint8_t     motor4_rpm_pcm;