diff --git a/.gitmodules b/.gitmodules
index 3a40aa3f..6d991b3d 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -2,3 +2,7 @@
 	path = Alice
 	url = git@github.com:hananiahhsu/Alice.git
 	branch = main
+[submodule "ToolChain"]
+	url = git@github.com:ToshihideMaskawa/ToolChain.git
+	path = ToolChain
+	branch = main
diff --git a/ToolChain b/ToolChain
new file mode 160000
index 00000000..44cf9e5a
--- /dev/null
+++ b/ToolChain
@@ -0,0 +1 @@
+Subproject commit 44cf9e5a0b0e6ef8c8f5a6145b0e57dfbddb949e