diff --git a/templates/logged_in.html b/templates/logged_in.html
index 19c455f..a5bdf9e 100644
--- a/templates/logged_in.html
+++ b/templates/logged_in.html
@@ -109,7 +109,7 @@
 
     <h2 id='tweet_archive_import'>Tweet archive import</h2>
     <p>
-    Twitter's API only lets us access up to 3200 of your most recent tweets. If you have more tweets than that, you can request an archive of your tweets from
+    Twitter's API only lets us access up to 3200 of your most recent tweets. If you have more tweets than that, you can request a zip archive of your tweets from
     <a href="https://twitter.com/settings/account">Twitter's settings page</a>,
     and upload it here.
     </p>
@@ -119,7 +119,7 @@
     {% endif %}
 
     <form action='{{url_for('upload_tweet_archive')}}' method='post' enctype='multipart/form-data'>
-        <input type="file" name='file'><input type="submit" value="Upload">
+        <input type="file" name='file' accept='application/zip,.zip'><input type="submit" value="Upload">
         <input type='hidden' name='csrf-token' value='{{g.viewer.csrf_token}}'>
     </form>