diff --git a/README.md b/README.md
index 902f2a8..dff6c77 100644
--- a/README.md
+++ b/README.md
@@ -16,6 +16,8 @@ The gCube Data Catalog Portlet powered by CKAN
 
 You can find the D4Science Catalogue documentation at [GCat Background Wiki Page](https://wiki.gcube-system.org/GCat_Background)
 
+Technical note (ITA) [D4Science_Catalogue_Service](https://gcube.wiki.gcube-system.org/images_gcube/4/4f/D4Science_Catalogue_Service.pdf)
+
 ## Change log
 
 See the [Releases](https://code-repo.d4science.org/gCubeSystem/gcube-ckan-datacatalog/releases)