fixed bug where dechex() was being fed the wrong variable for encoding space and tab characters at the end of a line of quoted-printable encoded content
diff --git a/user_guide/changelog.html b/user_guide/changelog.html
index 3aaf729..e0e2bef 100644
--- a/user_guide/changelog.html
+++ b/user_guide/changelog.html
@@ -82,6 +82,7 @@
<li>Fixed bug in xss_clean() that could remove some desirable tag attributes.</li>
<li>Fixed assorted user guide typos or examples (#4840, #4862, #4864, #4899, #4930).</li>
<li>Fixed an edit from 1.6.3 that made the $robots array in user_agents.php go poof.</li>
+ <li>Fixed a bug in the Email library with quoted-printable encoding improperly encoding space and tab characters.</li>
</ul>
<h2>Version 1.6.3</h2>