diff --git a/templates/index.html b/templates/index.html
index f04e317..476b194 100644
--- a/templates/index.html
+++ b/templates/index.html
@@ -151,8 +151,8 @@
                     {% endif %}
                     <p>
                         <strong>Legende:</strong>
-                        <span class="source wf">WF</span> = Wordfreq,
-                        <span class="source ot">OT</span> = OpenThesaurus
+                        <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
                     </p>
                 </div>
             {% endif %}