diff --git a/user_guide/changelog.html b/user_guide/changelog.html
index f24d811..0ebe74a 100644
--- a/user_guide/changelog.html
+++ b/user_guide/changelog.html
@@ -59,6 +59,23 @@
 
 <p>The <img src="images/reactor-bullet.png" width="16" height="16" alt="Reactor Marker" /> indicates items that were contributed to CodeIgniter via CodeIgniter Reactor.</p>
 
+<h2>Version 2.0.3</h2>
+<p>Release Date: Not Released</p>
+
+<ul>
+	<li>General Changes
+		<ul>
+			<li></li>
+		</ul>
+	</li>
+</ul>
+
+<h3>Bug fixes for 2.0.3</h3>
+<ul>
+	<li class="reactor">Added ENVIRONMENT to reserved constants. (Reactor #196)</li>
+	<li class="reactor">Changed server check to ensure SCRIPT_NAME is defined. (Reactor #57)</li>
+</ul>
+
 <h2>Version 2.0.2</h2>
 <p>Release Date: April 7, 2011<br />
 Hg Tag: v2.0.2</p>
diff --git a/user_guide/general/reserved_names.html b/user_guide/general/reserved_names.html
index d1ee295..00bebff 100644
--- a/user_guide/general/reserved_names.html
+++ b/user_guide/general/reserved_names.html
@@ -90,6 +90,7 @@
 </ul>
 <h3>Constants</h3>
 <ul>
+	<li>ENVIRONMENT</li>
 	<li>EXT</li>
 	<li>FCPATH</li>
 	<li>SELF</li>