Documented append_output() in the Output Class.
diff --git a/user_guide/libraries/output.html b/user_guide/libraries/output.html
index 1e42591..7be42b4 100644
--- a/user_guide/libraries/output.html
+++ b/user_guide/libraries/output.html
@@ -87,6 +87,14 @@
CodeIgniter functions like <var>$this->load->view()</var>.</p>
+<h2>$this->output->append_output();</h2>
+
+<p>Appends data onto the output string. Usage example:</p>
+
+<code>$this->output->append_output($data);</code>
+
+
+
<h2>$this->output->set_header();</h2>
<p>Permits you to manually set server headers, which the output class will send for you when outputting the final rendered display. Example:</p>