diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..54d568b
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "server/opensourcecobol4j"]
+	path = server/opensourcecobol4j
+	url = https://github.com/yutaro-sakamoto/opensourcecobol4j
diff --git a/server/opensourcecobol4j b/server/opensourcecobol4j
new file mode 160000
index 0000000..3dcaa5c
--- /dev/null
+++ b/server/opensourcecobol4j
@@ -0,0 +1 @@
+Subproject commit 3dcaa5c3349cef838dc65ab6e967401befc18ce3