diff --git a/img/mattermost.png b/img/mattermost.png
new file mode 100644
index 0000000..f56483e
Binary files /dev/null and b/img/mattermost.png differ
diff --git a/index.html b/index.html
index 3f9825f..f9ff07d 100644
--- a/index.html
+++ b/index.html
@@ -80,6 +80,13 @@
                         <span class="url">ecrire.delire.party</span>
                     </a>
                 </li>
+                <li>
+                    <a href="https://osef.delire.party/">
+                        <img src="img/mattermost.png" alt="Logo de Mattermost" />
+                        <span class="name">Mattermost</span>
+                        <span class="url">osef.delire.party</span>
+                    </a>
+                </li>
             </ul>
         </section>