diff --git a/app/raspberry_pi/src/car/system/movement/MovementSystem.hpp b/app/raspberry_pi/src/car/system/movement/MovementSystem.hpp
index 4bc0cb59..ca0ef206 100644
--- a/app/raspberry_pi/src/car/system/movement/MovementSystem.hpp
+++ b/app/raspberry_pi/src/car/system/movement/MovementSystem.hpp
@@ -38,11 +38,12 @@ namespace car::system::movement {
 		void terminate() {
 		}
 
-        // https://www.arduino.cc/en/Reference/Map
+        // From: https://github.com/chaoticmachinery/pca9685
         int map(int x, int in_min, int in_max, int out_min, int out_max) {
             return ((x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min);
         }
 
+        // From: https://github.com/chaoticmachinery/pca9685
         int setAngleToAnalog(int angle) {
             float pulse_wide;
             int analog_value;
@@ -52,6 +53,7 @@ namespace car::system::movement {
             return (analog_value);
         }
 
+        // From: https://github.com/chaoticmachinery/pca9685
 		void turn(const TurnCommand& command) {
             const float angle = std::clamp(command.angle, 1.0f, 179.0f);
             for (int channel = 0; channel < 2; channel++) {