diff --git a/include/pin_defs.h b/include/pin_defs.h
index 44f0db7..3a87e2f 100644
--- a/include/pin_defs.h
+++ b/include/pin_defs.h
@@ -96,10 +96,10 @@
 /////////////////////////////
 
 /////////// servos //////////
-#define SERVO_A 15
-#define SERVO_B 5
-#define SERVO_C 19
-#define SERVO_D 18
+#define SERVO_A 15 //GRIPPER
+#define SERVO_B 5  //ELBOW
+#define SERVO_C 18 //ARM
+#define SERVO_D 19 //BASE
 /////////////////////////////
 
 //////// led matrix /////////
@@ -109,4 +109,4 @@
 #define SHIFT_REGISTER_RCLK  13
 /////////////////////////////
 
-#endif
\ No newline at end of file
+#endif