fixed a series of "next" and "previous" topic links that pointed to the wrong pages.
diff --git a/user_guide/changelog.html b/user_guide/changelog.html
index 2c20ce5..0d6e3ef 100644
--- a/user_guide/changelog.html
+++ b/user_guide/changelog.html
@@ -79,7 +79,7 @@
 <h3>Bug fixes for 1.6.4</h3>

 <ul>

 	<li>Fixed bug in xss_clean() that could remove some desirable tag attributes.</li>

-	<li>Fixed assorted user guide typos or examples (#4840, #4862).</li>

+	<li>Fixed assorted user guide typos or examples (#4840, #4862, #4864).</li>

 </ul>

 

 <h2>Version 1.6.3</h2>