diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000000000000000000000000000000000000..030632bb83b76a70856fcfc4eb2239a2984681e2
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,9 @@
+[submodule "doc_module_vitis"]
+	path = doc_module_vitis
+	url = http://vm09.veremes.net/Documentation/doc_module_vitis.git
+[submodule "doc_module_calimap"]
+	path = doc_module_calimap
+	url = http://vm09.veremes.net/Documentation/doc_module_calimap.git
+[submodule "doc_module_gracethd"]
+	path = doc_module_gracethd
+	url = http://vm09.veremes.net/Documentation/doc_module_gracethd.git
diff --git a/doc_module_calimap b/doc_module_calimap
new file mode 160000
index 0000000000000000000000000000000000000000..cf9723e02c9718dd5cb54c7d8f7b46f28ca44640
--- /dev/null
+++ b/doc_module_calimap
@@ -0,0 +1 @@
+Subproject commit cf9723e02c9718dd5cb54c7d8f7b46f28ca44640
diff --git a/doc_module_gracethd b/doc_module_gracethd
new file mode 160000
index 0000000000000000000000000000000000000000..d788107d233b97498be89b016466dcdf28c19043
--- /dev/null
+++ b/doc_module_gracethd
@@ -0,0 +1 @@
+Subproject commit d788107d233b97498be89b016466dcdf28c19043
diff --git a/doc_module_vitis b/doc_module_vitis
new file mode 160000
index 0000000000000000000000000000000000000000..058f00a7ae7d2642b5b8e0a34679011d29f21297
--- /dev/null
+++ b/doc_module_vitis
@@ -0,0 +1 @@
+Subproject commit 058f00a7ae7d2642b5b8e0a34679011d29f21297