diff --git a/user_guide/general/environments.html b/user_guide/general/environments.html
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+++ b/user_guide/general/environments.html
@@ -0,0 +1,126 @@
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+<title>Creating Libraries : CodeIgniter User Guide</title>
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+<td><h1>CodeIgniter User Guide Version 2.0.0</h1></td>
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+<a href="http://codeigniter.com/">CodeIgniter Home</a> &nbsp;&#8250;&nbsp;
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+Creating Libraries
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+<div id="content">
+
+<h1>Handling Multiple Environments</h1>
+
+<p>
+    Developers often desire different system behavior depending on whether
+    an application is running in a development or production
+    environment. For example, verbose error output is something that would
+    be useful while developing an application, but it may also pose a security issue when "live".
+</p>
+
+<h2>The ENVIRONMENT Constant</h2>
+
+<p>
+    By default, CodeIgniter comes with the environment constant set to
+    '<kbd>development</kbd>'. At the top of index.php, you will see:
+</p>
+
+<code>
+define('<var>ENVIRONMENT</var>', '<var>development</var>');
+</code>
+
+<p>
+    In addition to affecting some basic framework behavior (see the next section),
+    you may use this constant in your own development to differentiate
+    between which environment you are running in.
+</p>
+
+<h2>Effects On Default Framework Behavior</h2>
+
+<p>
+    There are some places in the CodeIgniter system where the <kbd>ENVIRONMENT</kbd>
+    constant is used. This section describes how default framework behavior is
+    affected.
+</p>
+
+<h3>Error Reporting</h3>
+
+<p>
+    Setting the <kbd>ENVIRONMENT</kbd> constant to a value of '<kbd>development</kbd>' will
+    cause all PHP errors to be rendered to the browser when they occur. Conversely,
+    setting the constant to '<kbd>production</kbd>' will disable all error output. Disabling
+    error reporting in production is a <a href="security.html">good security practice</a>.
+</p>
+
+<h3>Configuration Files</h3>
+
+<p>
+    Optionally, you can have CodeIgniter load environment-specific
+    configuration files. This may be useful for managing things like differing API keys
+    across multiple environments. This is described in more detail in the
+    environment section of the <a href="../libraries/config.html#environments">Config Class</a> documentation.
+</p>
+
+</div>
+<!-- END CONTENT -->
+
+
+<div id="footer">
+<p>
+Previous Topic:&nbsp;&nbsp;<a href="libraries.html">Using CodeIgniter Libraries</a>
+&nbsp;&nbsp;&nbsp;&middot;&nbsp;&nbsp;
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+
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+</html>
\ No newline at end of file
diff --git a/user_guide/general/security.html b/user_guide/general/security.html
index 8a41dff..5ecfcf1 100644
--- a/user_guide/general/security.html
+++ b/user_guide/general/security.html
@@ -87,6 +87,23 @@
 <p>During system initialization all global variables are unset, except those found in the $_POST and $_COOKIE arrays. The unsetting
 routine is effectively the same as register_globals = off.</p>
 
+<a name="error_reporting"></a>
+<h2>error_reporting</h2>
+
+<p>
+    In production environments, it is typically desirable to disable PHP's 
+    error reporting by setting the internal error_reporting flag to a value of 0. This disables native PHP
+    errors from being rendered as output, which may potentially contain
+    sensitive information.
+</p>
+
+<p>
+    Setting CodeIgniter's <kbd>ENVIRONMENT</kbd> constant in index.php to a
+    value of '<kbd>production</kbd>' will turn off these errors. In development
+    mode, it is recommended that a value of '<kbd>development</kbd>' is used.
+    More information about differentiating between environments can be found
+    on the <a href="environments.html">Handling Environments</a> page.
+</p>
 
 <h2>magic_quotes_runtime</h2>