diff --git a/src/config/preset_config.h b/src/config/preset_config.h
index 054fb08..d167f03 100644
--- a/src/config/preset_config.h
+++ b/src/config/preset_config.h
@@ -1,3 +1,5 @@
+// TODO: remove this file in the future, replace all global variables with config.xxx
+
 /* speedie's maomao config */
 
 #define COLOR(hex)                                                             \