diff --git a/os/hal/ports/STM32/STM32G4xx/stm32_registry.h b/os/hal/ports/STM32/STM32G4xx/stm32_registry.h
index 7e2bc3019..50ef60fff 100644
--- a/os/hal/ports/STM32/STM32G4xx/stm32_registry.h
+++ b/os/hal/ports/STM32/STM32G4xx/stm32_registry.h
@@ -327,7 +327,11 @@
 
 #endif /* defined(STM32G474xx) || defined(STM32G484xx) */
 
-#if defined(STM32G491xx) ||    \
+/*===========================================================================*/
+/* STM32G491xx.                                                              */
+/*===========================================================================*/
+
+#if defined(STM32G491xx) ||                                                 \
     defined(__DOXYGEN__)
 
 /* ADC attributes.*/