diff --git a/os/hal/ports/STM32/STM32F4xx/hal_lld.h b/os/hal/ports/STM32/STM32F4xx/hal_lld.h
index 3ec335603..9defd2c3b 100644
--- a/os/hal/ports/STM32/STM32F4xx/hal_lld.h
+++ b/os/hal/ports/STM32/STM32F4xx/hal_lld.h
@@ -1405,7 +1405,8 @@
 #endif
 
 /**
- * @brief   Timers 2, 3, 4, 5, 6, 7, 9, 10, 11, 12, 13, 14 clock.
+ * @brief   Clock of timers connected to AHB1
+ *          (Timers 2, 3, 4, 5, 6, 7, 12, 13, 14).
  */
 #if (STM32_PPRE1 == STM32_PPRE1_DIV1) || defined(__DOXYGEN__)
 #define STM32_TIMCLK1               (STM32_PCLK1 * 1)
@@ -1414,7 +1415,7 @@
 #endif
 
 /**
- * @brief   Timers 1, 8 clock.
+ * @brief   Clock of timers connected to AHB2 (Timers 1, 8, 9, 10, 11).
  */
 #if (STM32_PPRE2 == STM32_PPRE2_DIV1) || defined(__DOXYGEN__)
 #define STM32_TIMCLK2               (STM32_PCLK2 * 1)