diff --git a/main.c b/main.c
index 285b974..41e15f0 100644
--- a/main.c
+++ b/main.c
@@ -150,6 +150,9 @@ static inline void switchMode(void)
     eModeCurrent = (eModeCurrent + 1) % MAX_COUNT;
 }
 
+/**
+ * @brief Init PWM for PA2
+ */
 void initPWM(void)
 {
     // No PORTMUX needed - PA2 is WO2 by default
@@ -164,6 +167,9 @@ void initPWM(void)
     TCA0.SINGLE.CTRLA = TCA_SINGLE_CLKSEL_DIV1_gc | TCA_SINGLE_ENABLE_bm;
 }
 
+/**
+ * @brief Set PWM duty cycle for PA2
+ */
 void setPWM_PA2(uint8_t duty)
 {
     TCA0.SINGLE.CMP2 = duty;
@@ -421,14 +427,14 @@ void ledAnimationGlow(void)
     brightness += direction;
 
     // Reverse direction at limits
-    if (brightness >= 100)
+    if (brightness >= 100U)
     {
-        brightness = 100;
+        brightness = 100U;
         direction = -1;
     }
-    else if (brightness == 0)
+    else if (brightness == 10U)
     {
-        brightness = 0;
+        brightness = 10U;
         direction = 1;
     }