diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..a055438
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "constant/mech"]
+	path = constant/mech
+	url = git@gitlab.com:park0d/reaction-mechanisms.git
diff --git a/constant/mech b/constant/mech
new file mode 160000
index 0000000..c074ebd
--- /dev/null
+++ b/constant/mech
@@ -0,0 +1 @@
+Subproject commit c074ebd71031111880cd6a23f88a5c23ac658463