diff --git a/os/hal/platforms/STM32F4xx/adc_lld.c b/os/hal/platforms/STM32F4xx/adc_lld.c
index b31ca178c..29ed6fcc2 100644
--- a/os/hal/platforms/STM32F4xx/adc_lld.c
+++ b/os/hal/platforms/STM32F4xx/adc_lld.c
@@ -266,7 +266,8 @@ void adc_lld_start(ADCDriver *adcp) {
     }
 #endif /* STM32_ADC_USE_ADC3 */
 
-    /* ADC initial setup, starting the analog part.*/
+    /* ADC initial setup, starting the analog part here in order to reduce
+       the latency when starting a conversion.*/
     adcp->adc->CR1 = 0;
     adcp->adc->CR2 = ADC_CR2_ADON;
   }