diff --git a/_layouts/post.html b/_layouts/post.html
index c24a2f5..43415f6 100644
--- a/_layouts/post.html
+++ b/_layouts/post.html
@@ -22,7 +22,7 @@
                 <hr class="byline">
 
                 <section class="byline-time">
-                    <section class="byline e-bridgy-mastodon-content ">
+                    <section class="byline p-summary e-bridgy-mastodon-content">
                         {{page.excerpt}}
                     </section>
                     <time class="dt-label dt-published" datetime="{{ page.date | date_to_xmlschema }}">{{ page.date | date_to_string }}</time>