diff --git a/src/system.c b/src/system.c
--- a/src/system.c
+++ b/src/system.c
@@ -32,6 +32,7 @@ void sysclk_init(void)
     RCC_ClkInitTypeDef RCC_ClkInitStruct;
     RCC_PeriphCLKInitTypeDef PeriphClkInit;
 
+    // TODO: Probably disable HSI14? This only drives the ADC
     RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI|RCC_OSCILLATORTYPE_HSI14|RCC_OSCILLATORTYPE_LSI;
     RCC_OscInitStruct.HSIState = RCC_HSI_ON;
     RCC_OscInitStruct.HSI14State = RCC_HSI14_ON;