diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..c8edf6a
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "fmt"]
+	path = fmt
+	url = https://github.com/fmtlib/fmt
diff --git a/fmt b/fmt
new file mode 160000
index 0000000..638db5c
--- /dev/null
+++ b/fmt
@@ -0,0 +1 @@
+Subproject commit 638db5ca5e47066b0b9ac297bdcfcae69ccd0276