diff --git a/templates/index.html b/templates/index.html
index 476b194..2f6f65f 100644
--- a/templates/index.html
+++ b/templates/index.html
@@ -152,7 +152,7 @@
                     <p>
                         <strong>Legende:</strong>
                         <span class="source wf">WF</span> = <a href="https://pypi.org/project/wordfreq/" target="_blank" rel="noopener noreferrer">Wordfreq</a>,
-                        <span class="source ot">OT</span> = <span class="source ot">OT</span> = <a href="https://www.openthesaurus.de" target="_blank" rel
+                        <span class="source ot">OT</span> = <a href="https://www.openthesaurus.de" target="_blank" rel="noopener noreferrer">OpenThesaurus</a>
                     </p>
                 </div>
             {% endif %}