--- a/content/10MHz_ref.rst	Sat Mar 12 17:37:27 2016 +0100
+++ b/content/10MHz_ref.rst	Sat Mar 12 17:37:51 2016 +0100
@@ -6,7 +6,7 @@
 :date: 2016-02-21
 :Category: Electronics
 :Tags: test equipment, 10MHz, Rubidium
-
+:series: 10MHz Bench Reference Standard
 
 Many electronics test equipment need an accurate time base. Most
 often, it's build on a 10MHz base.