diff --git a/web/index.html b/web/index.html
index 514a8bd..0fa1334 100644
--- a/web/index.html
+++ b/web/index.html
@@ -15,6 +15,9 @@
             Animations will loop at 2 frames per second,
             for up to 8 frames.
         </p>
+        <p>
+            <a href="https://pixilart.com/">Pixilart</a> generates these files.
+        </p>
         <form action="upload" method="post" enctype="multipart/form-data">
             <input type="file" name="image">
             <input type="submit" value="Upload">