diff --git a/blog/templates/second-edition/extra.html b/blog/templates/second-edition/extra.html
index 105ff0be..041e2e1e 100644
--- a/blog/templates/second-edition/extra.html
+++ b/blog/templates/second-edition/extra.html
@@ -5,7 +5,7 @@
 {% block title %}{{ page.title }} | {{ config.title }}{% endblock title %}
 
 {% block description -%}
-{{ page.summary | safe | striptags }}
+{{ page.summary | safe | striptags | truncate(length=150) }}
 {%- endblock description %}
 
 {% block main %}