diff --git a/src/main.cpp b/src/main.cpp
index 2ab44ca..78f393a 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,7 +1,7 @@
 #include <Arduino.h>
 
 int sensorPin = A7;
-int PWM = 7;
+int PWM = 7; // Fan
 int sensorVal;
 int PWMVal;
 bool fanRunning = false;