diff --git a/cps/templates/detail.html b/cps/templates/detail.html
index 1bdf9f967..c230b069b 100644
--- a/cps/templates/detail.html
+++ b/cps/templates/detail.html
@@ -22,7 +22,7 @@
               </button>
                 {% for format in entry.data %}
                 <a href="{{ url_for('get_download_link_ext', book_id=entry.id, book_format=format.format|lower, anyname=entry.id|string+'.'+format.format) }}" id="btnGroupDrop1{{format.format|lower}}" class="btn btn-primary" role="button">
-                  <span class="glyphicon glyphicon-download"></span>{{format.format}}
+                  <span class="glyphicon glyphicon-download"></span>{{format.format}} ({{ format.uncompressed_size|filesizeformat }})
                 </a>
                 {% endfor %}
               {% else %}
@@ -32,7 +32,7 @@
                 </button>
                 <ul class="dropdown-menu" aria-labelledby="btnGroupDrop1">
                 {% for format in entry.data %}
-                  <li><a href="{{ url_for('get_download_link_ext', book_id=entry.id, book_format=format.format|lower, anyname=entry.id|string+'.'+format.format) }}">{{format.format}}</a></li>
+                  <li><a href="{{ url_for('get_download_link_ext', book_id=entry.id, book_format=format.format|lower, anyname=entry.id|string+'.'+format.format) }}">{{format.format}} ({{ format.uncompressed_size|filesizeformat }})</a></li>
                 {% endfor %}
                 </ul>
               {% endif %}