diff --git a/components/esp_system/include/esp_private/system_internal.h b/components/esp_system/include/esp_private/system_internal.h
index 66912a54b4..2125fa7ff4 100644
--- a/components/esp_system/include/esp_private/system_internal.h
+++ b/components/esp_system/include/esp_private/system_internal.h
@@ -61,11 +61,11 @@ void esp_reset_reason_set_hint(esp_reset_reason_t hint);
  */
 esp_reset_reason_t esp_reset_reason_get_hint(void);
 
-
 /**
  * @brief Get the time in microseconds since startup
  *
- * @returns time since startup in microseconds
+ * @returns time since g_startup_time; definition should be fixed by system time provider
+ * no matter the underlying timer used.
  */
 int64_t esp_system_get_time(void);
 
diff --git a/components/esp_timer/include/esp_timer.h b/components/esp_timer/include/esp_timer.h
index 97459b45eb..bb8879cd93 100644
--- a/components/esp_timer/include/esp_timer.h
+++ b/components/esp_timer/include/esp_timer.h
@@ -184,8 +184,7 @@ esp_err_t esp_timer_delete(esp_timer_handle_t timer);
 
 /**
  * @brief Get time in microseconds since boot
- * @return number of microseconds since esp_timer_init was called (this normally
- *          happens early during application startup).
+ * @return number of microseconds since underlying timer has been started
  */
 int64_t esp_timer_get_time(void);