diff --git a/.gitmodules b/.gitmodules
index a88e9fe..d361786 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -40,3 +40,6 @@
 [submodule "lib/phpdocumentor"]
 	path = lib/phpdocumentor
 	url = ../lib_phpdocumentor.git
+[submodule "docu/system"]
+	path = docu/system
+	url = ../docu_system.git
diff --git a/docu/system b/docu/system
new file mode 160000
index 0000000..0058387
--- /dev/null
+++ b/docu/system
@@ -0,0 +1 @@
+Subproject commit 0058387aea643d658746c837ed51284dd25c0f75