diff --git a/user_guide/libraries/validation.html b/user_guide/libraries/validation.html
index 0f8b141..f4beb56 100644
--- a/user_guide/libraries/validation.html
+++ b/user_guide/libraries/validation.html
@@ -709,7 +709,7 @@
 
 <div id="footer">
 <p>
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+Previous Topic:&nbsp;&nbsp;<a href="user_agent.html">User Agent Class</a>
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 <a href="#top">Top of Page</a>&nbsp;&nbsp;&nbsp;&middot;&nbsp;&nbsp;
 <a href="../index.html">User Guide Home</a>&nbsp;&nbsp;&nbsp;&middot;&nbsp;&nbsp;