diff --git a/.gitmodules b/.gitmodules
index e676f24f..8280f76a 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -10,3 +10,6 @@
 [submodule "extlib/xvect"]
 	path = extlib/xvect
 	url = git://github.com/wasabiz/xvect.git
+[submodule "extlib/benz"]
+	path = extlib/benz
+	url = git://github.com/picrin-scheme/benz.git
diff --git a/extlib/benz b/extlib/benz
new file mode 160000
index 00000000..a3a8b11d
--- /dev/null
+++ b/extlib/benz
@@ -0,0 +1 @@
+Subproject commit a3a8b11d4b47a1ddfda8fe05aefa12c77b24a1cc