diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..6fab7f6
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "isaac-typescript-definitions"]
+	path = isaac-typescript-definitions
+	url = https://github.com/IsaacScript/isaac-typescript-definitions
diff --git a/isaac-typescript-definitions b/isaac-typescript-definitions
new file mode 160000
index 0000000..97cbc98
--- /dev/null
+++ b/isaac-typescript-definitions
@@ -0,0 +1 @@
+Subproject commit 97cbc98f9b23536363aa4e04d03fbaa81ab88b7e