diff --git a/src/glpy/__init__.pyi b/src/glpy/__init__.pyi
index e69de29..42ca498 100644
--- a/src/glpy/__init__.pyi
+++ b/src/glpy/__init__.pyi
@@ -0,0 +1 @@
+def pytest_glfw_window()->int:...
\ No newline at end of file
diff --git a/src/main.py b/src/main.py
index 3309e07..c3f93a3 100644
--- a/src/main.py
+++ b/src/main.py
@@ -1,2 +1,3 @@
 import glpy as gl
 
+print(gl.pytest_glfw_window())