diff --git a/components/esp_event/include/esp_event.h b/components/esp_event/include/esp_event.h
index fcf61dc09f2..6bed74d1958 100644
--- a/components/esp_event/include/esp_event.h
+++ b/components/esp_event/include/esp_event.h
@@ -63,6 +63,7 @@ esp_err_t esp_event_loop_delete(esp_event_loop_handle_t event_loop);
  * @return
  *  - ESP_OK: Success
  *  - ESP_ERR_NO_MEM: Cannot allocate memory for event loops list
+ *  - ESP_ERR_INVALID_STATE: Default event loop has already been created
  *  - ESP_FAIL: Failed to create task loop
  *  - Others: Fail
  */