diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000000000000000000000000000000000000..bee6890593ea8c65fa17438fce2448ae3d93cce1
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,12 @@
+[submodule "doc_module_vitis"]
+	path = doc_module_vitis
+	url = http://vm09.veremes.net/Documentation/doc_module_vitis.git
+[submodule "doc_module_vmap"]
+	path = doc_module_vmap
+	url = http://vm09.veremes.net/Documentation/doc_module_vmap.git
+[submodule "doc_module_dtnet"]
+	path = doc_module_dtnet
+	url = http://vm09.veremes.net/Documentation/doc_module_dtnet.git
+[submodule "doc_module_gtf"]
+	path = doc_module_gtf
+	url = http://vm09.veremes.net/Documentation/doc_module_gtf.git
diff --git a/doc_module_dtnet b/doc_module_dtnet
new file mode 160000
index 0000000000000000000000000000000000000000..2df5660d88c3777a24b8d5bb307db2d2e1410b1b
--- /dev/null
+++ b/doc_module_dtnet
@@ -0,0 +1 @@
+Subproject commit 2df5660d88c3777a24b8d5bb307db2d2e1410b1b
diff --git a/doc_module_gtf b/doc_module_gtf
new file mode 160000
index 0000000000000000000000000000000000000000..84f0b86d9ab5024dffffcb66e5d484676b2d0c1e
--- /dev/null
+++ b/doc_module_gtf
@@ -0,0 +1 @@
+Subproject commit 84f0b86d9ab5024dffffcb66e5d484676b2d0c1e
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
diff --git a/doc_module_vmap b/doc_module_vmap
new file mode 160000
index 0000000000000000000000000000000000000000..c9dc1ddf744c1c7c19413907f2de898a78ca470c
--- /dev/null
+++ b/doc_module_vmap
@@ -0,0 +1 @@
+Subproject commit c9dc1ddf744c1c7c19413907f2de898a78ca470c