diff --git a/src/octoprint/templates/dialogs/about/about.jinja2 b/src/octoprint/templates/dialogs/about/about.jinja2
index e207b363..3803eba2 100644
--- a/src/octoprint/templates/dialogs/about/about.jinja2
+++ b/src/octoprint/templates/dialogs/about/about.jinja2
@@ -42,3 +42,8 @@
     respective licenses, which can be found under "Third Party Licenses" to
     the left. Copyright of those dependencies lies with their respective authors
 </p>
+
+<p><small>
+    The OctoPrint brand is a registered trademark of MundoReader, S.L
+    (<a href="http://octoprint.org/trademark-rules/">Trademark Rules</a>).
+</small></p>