Added docs for config->base_url() changes.
diff --git a/user_guide/libraries/config.html b/user_guide/libraries/config.html
index 98b6052..103161f 100644
--- a/user_guide/libraries/config.html
+++ b/user_guide/libraries/config.html
@@ -175,6 +175,11 @@
<h2>$this->config->site_url();</h2>
<p>This function retrieves the URL to your site, along with the "index" value you've specified in the config file.</p>
+<h2>$this->config->base_url();</h2>
+<p>This function retrieves the URL to your site, plus an optional path such as to a stylesheet or image.</p>
+
+<p>The two functions above are normally accessed via the corresponding functions in the <a href="../helpers/url_helper.html">URL Helper.</a></p>
+
<h2>$this->config->system_url();</h2>
<p>This function retrieves the URL to your <dfn>system folder</dfn>.</p>