diff --git a/README.md b/README.md
index 0388df8..00304ae 100644
--- a/README.md
+++ b/README.md
@@ -20,4 +20,4 @@ credits: Marilena Daquino (UNIBO), Martin Hlosta (FFHS, external collaborator),
 
 Working demo: https://projects.dharc.unibo.it/musow/.
 
-Documentation.
+Documentation: https://polifonia-project.github.io/clef/
diff --git a/data/.gitkeep b/data/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/index.html b/index.html
index 9454d13..8a9650d 100644
--- a/index.html
+++ b/index.html
@@ -29,6 +29,7 @@
       <h1>CLEF. Crowdsourcing Linked Entities via web Form</h1>
       <img src="https://zenodo.org/badge/368253077.svg" alt="">
       <img src="https://img.shields.io/badge/License-ISC-blue.svg" alt="">
+      <p><a href="https://github.com/polifonia-project/clef"></a>Source code</p>
       <section>
         <h5>Introduction</h5>
         <p>CLEF is a lightweight Linked Open Data (LOD) native cataloguing system tailored to small-medium collaborative projects.