diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..e1a7279
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "s-151"]
+	path = s-151
+	url = git@gitea.rkcf.me:rkcf/s-151.git
diff --git a/s-151 b/s-151
new file mode 160000
index 0000000..1b05956
--- /dev/null
+++ b/s-151
@@ -0,0 +1 @@
+Subproject commit 1b059566d46d2f6a5bc3350ae85506ac834fe1b6