diff --git a/.gitmodules b/.gitmodules
index 427ad5a..4278b52 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -17,3 +17,6 @@
 [submodule "lib/folding"]
 	path = lib/folding
 	url = https://github.com/rmontanana/folding
+[submodule "lib/Files"]
+	path = lib/Files
+	url = https://github.com/rmontanana/ArffFiles
diff --git a/lib/Files b/lib/Files
new file mode 160000
index 0000000..dbefa02
--- /dev/null
+++ b/lib/Files
@@ -0,0 +1 @@
+Subproject commit dbefa02d9c0ca0f029f77e744cd80cb0150725c8