diff --git a/pymake/cmake.py b/pymake/cmake.py
index 30569ea..b659eb8 100644
--- a/pymake/cmake.py
+++ b/pymake/cmake.py
@@ -55,4 +55,8 @@ class cmake:
 
     def file(self,new_var_name:"str",mode:"str"=glob_recurse,*search_str:"str")->"cmake":
         self.__write_stack.append(f"file({mode} {new_var_name} {args_to_str(search_str)})")
+        return self
+    
+    def add_subdirectory(self,path:str)->'cmake':
+        self.__write_stack.append(f"add_subdirectory({path}))")
         return self
\ No newline at end of file