diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..2efe56b
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "printf"]
+	path = printf
+	url = git@github.com:lithiumox-codam/printf.git
diff --git a/printf b/printf
new file mode 160000
index 0000000..d7caafc
--- /dev/null
+++ b/printf
@@ -0,0 +1 @@
+Subproject commit d7caafcf400e25b357859b3dea85fb827a90479c