diff --git a/css/index.css b/css/index.css
index fe5d9b0..2c34ab7 100644
--- a/css/index.css
+++ b/css/index.css
@@ -5,3 +5,7 @@
 form label {
   font-weight: bold;
 }
+
+.disclaimer {
+  font-size: 14px;
+}
diff --git a/index.php b/index.php
index 56a41fb..4f7dc8f 100644
--- a/index.php
+++ b/index.php
@@ -30,6 +30,8 @@
       </p>
     </form>
 
+    <p class="disclaimer">Font: <a href="https://developer.tmb.cat/">TMB</a>. Dades actualitzades cada setmana.</p>
+
     <script src="js/index.js"></script>
   </body>
 </html>