diff --git a/user_guide/changelog.html b/user_guide/changelog.html
index 25633b6..5740f73 100644
--- a/user_guide/changelog.html
+++ b/user_guide/changelog.html
@@ -100,6 +100,7 @@
 			<li>Added a second parameter (boolean) to <kbd>$this->zip->read_dir('/path/to/directory', FALSE)</kbd> to remove the preceding trail of empty folders when creating a Zip archive. This example would contain a zip with "directory" and all of its contents.</li>
 			<li>Added ability in the Image Library to handle PNG transparency for resize operations when using the GD lib.</li>
 			<li>Modified the Session class to prevent use if no encryption key is set in the config file.</li>
+			<li>Added a new config item to the Session class <kbd>sess_expire_on_close</kbd> to allow sessions to auto-expire when the browser window is closed.</li>
 			<li>Improved performance of the Encryption library on servers where Mcrypt is available.</li>
 			<li>Changed the default encryption mode in the Encryption library to CBC.</li>
 			<li>Added an <kbd>encode_from_legacy()</kbd> method to provide a way to transition encrypted data from CodeIgniter 1.x to CodeIgniter 2.x.
diff --git a/user_guide/libraries/sessions.html b/user_guide/libraries/sessions.html
index 3bd170d..2d295d7 100644
--- a/user_guide/libraries/sessions.html
+++ b/user_guide/libraries/sessions.html
@@ -258,6 +258,12 @@
 	<td class="td">The number of seconds you would like the session to last. The default value is 2 hours (7200 seconds). If you would like a non-expiring session set the value to zero: 0</td>
 </tr>
 <tr>
+	<td class="td"><strong>sess_expire_on_close</strong></td>
+	<td class="td">FALSE</td>
+	<td class="td">TRUE/FALSE (boolean)</td>
+	<td class="td">Whether to cause the session to expire automatically when the browser window is closed.</td>
+</tr>
+<tr>
 	<td class="td"><strong>sess_encrypt_cookie</strong></td>
 	<td class="td">FALSE</td>
 	<td class="td">TRUE/FALSE (boolean)</td>