diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000000000000000000000000000000000000..a4742eac4482b9d860fc688ddfe176db368c2f1f
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,6 @@
+[submodule "ttcn\\LibCommon"]
+	path = ttcn\\LibCommon
+	url = https://forge.etsi.org/rep/LIBS/LibCommon.git
+[submodule "ttcn\\LibIts"]
+	path = ttcn\\LibIts
+	url = https://forge.etsi.org/rep/LIBS/LibIts
diff --git a/README.md b/README.md
index fbed14274836b3f85e33dded70fec219b68ea814..b6c850bb3a420b65e2d863c7059cff02fcb6d347 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,18 @@ https://forge.etsi.org/etsi-software-license
 
 NOTE All draft can be found in the 'IETF XML Registry', accessible [here](https://www.iana.org/assignments/xml-registry/xml-registry.xhtml)
 
+## Download required libraries
 
+This projects requires the LibCommon and LibIts libraries to compile. The libraries location are git submodules of the current repository.
+
+Once you have cloned the present repository, in order to install the libraries you want to execute:
+
+    git submodule init
+    git submodule update
+
+Alternatively, you may clone the project together with the required libraries with the following command:
+
+    git clone --recurse-submodules <URL to the repository>
 
 ## Installation
 
diff --git a/ttcn/LibCommon b/ttcn/LibCommon
index 8f0b6280029f2b786f289ee6cf671553a4806b17..21bad7c51917d19bebdff5b36983e22922421976 160000
--- a/ttcn/LibCommon
+++ b/ttcn/LibCommon
@@ -1 +1 @@
-Subproject commit 8f0b6280029f2b786f289ee6cf671553a4806b17
+Subproject commit 21bad7c51917d19bebdff5b36983e22922421976
diff --git a/ttcn/LibIts b/ttcn/LibIts
index fa803fc714e8896de7ce12d0ecec822b5e8949dc..e52379698e945eb9631b229c5438de9f74efb6a0 160000
--- a/ttcn/LibIts
+++ b/ttcn/LibIts
@@ -1 +1 @@
-Subproject commit fa803fc714e8896de7ce12d0ecec822b5e8949dc
+Subproject commit e52379698e945eb9631b229c5438de9f74efb6a0