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diff --git a/about.html b/about.html
index b8014f8..b9b1cd7 100644
--- a/about.html
+++ b/about.html
@@ -20,6 +20,7 @@ Copyright © 2019
 
 <ul>
 <li><a href="/nevsky/info/rules.html">Rules of Play</a>
+<li><a href="/nevsky/info/playbook.html">Background Book</a>
 <li><a href="/nevsky/info/pac.html">Reference Sheets</a>
 <li><a href="/nevsky/info/cards.html">Arts of War</a>
 <li><a href="/nevsky/info/lords.html">Lord Mats</a>