diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index f9696af..cf3164c 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -1,3 +1,10 @@
+# LOCATION: projectroot/src
 add_executable(main
-    main.c    
+    main.c 
+    ch32v20x_it.c
 )
+
+add_subdirectory(core)
+add_subdirectory(peripheral)
+add_subdirectory(system)
+add_subdirectory(startup)