diff --git a/.gitmodules b/.gitmodules
index e69de29..d46677d 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -0,0 +1,4 @@
+[submodule "extension"]
+	path = extension
+	url = git@github.com:notion-enhancer/extension.git
+	branch = dev
diff --git a/extension b/extension
new file mode 160000
index 0000000..0ee1f96
--- /dev/null
+++ b/extension
@@ -0,0 +1 @@
+Subproject commit 0ee1f969723ca456ace9105a154e7bb0f0a8e806