diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..f45940c
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "fi"]
+	path = fi
+	url = https://github.com/cafour/fi
diff --git a/fi b/fi
new file mode 160000
index 0000000..e08e804
--- /dev/null
+++ b/fi
@@ -0,0 +1 @@
+Subproject commit e08e804aab28594fa2fc0dbd5d2ecf03efe60d8f