diff --git a/system/application/config/config.php b/system/application/config/config.php
index a02fed1..72d3819 100644
--- a/system/application/config/config.php
+++ b/system/application/config/config.php
@@ -123,7 +123,7 @@
 | DO NOT CHANGE THIS UNLESS YOU FULLY UNDERSTAND THE REPERCUSSIONS!!
 |
 */
-$config['permitted_uri_chars'] = 'a-z 0-9~%.:_-';
+$config['permitted_uri_chars'] = 'a-z 0-9~%.:_\-';
 
 
 /*
diff --git a/user_guide/changelog.html b/user_guide/changelog.html
index 6ea7d3a..c245c73 100644
--- a/user_guide/changelog.html
+++ b/user_guide/changelog.html
@@ -89,6 +89,7 @@
 			<li>Added $_SERVER, $_FILES, $_ENV, and $_SESSION to sanitization of globals.</li>
 		    <li>Added a <a href="./helpers/path_helper.html">Path Helper</a>.</li>
 			<li>Simplified _reindex_segments() in the URI class</li>
+			<li>Escaped the '-' in the default 'permitted_uri_chars' config item, to prevent errors if developers just try to add additional characters to the end of the default expression.</li>
 		</ul>
 	</li>
 </ul>