diff --git a/system/core/Input.php b/system/core/Input.php
index 52ea71b..6f88b19 100644
--- a/system/core/Input.php
+++ b/system/core/Input.php
@@ -624,6 +624,21 @@
 		return $this->headers[$index];		
 	}
 
+	// --------------------------------------------------------------------
+	
+	/**
+	 * Is ajax Request?
+	 *
+	 * Test to see if a request contains the HTTP_X_REQUESTED_WITH header
+	 *
+	 * @return 	boolean 	
+	 */
+	public function is_ajax_request()
+	{
+		$req_source = $this->server('HTTP_X_REQUESTED_WITH');
+		return ($req_source == 'XMLHttpRequest') ? TRUE : FALSE;
+	}
+
 }
 // END Input class
 
diff --git a/user_guide/changelog.html b/user_guide/changelog.html
index d5bf1b7..c3693e5 100644
--- a/user_guide/changelog.html
+++ b/user_guide/changelog.html
@@ -108,7 +108,7 @@
 				Please see the <a href="./installation/upgrade_200.html">upgrade instructions</a> for details.</li>
 			<li>Altered Form_Validation library to allow for method chaining on <kbd>set_rules()</kbd>, <kbd>set_message()</kbd> and <kbd>set_error_delimiters()</kbd> functions.</li>
 			<li>Altered Email Library to allow for method chaining.</li>
-			<li>Added <kbd>request_headers()</kbd> and <kbd>get_request_header</kbd> to the input class.</li>
+			<li>Added <kbd>request_headers()</kbd>, <kbd>get_request_header()</kbd> and <kbd>is_ajax_request()</kbd> to the input class.</li>
 		</ul>
 	</li>
 	<li>Database
diff --git a/user_guide/libraries/input.html b/user_guide/libraries/input.html
index 7044213..d838cf0 100644
--- a/user_guide/libraries/input.html
+++ b/user_guide/libraries/input.html
@@ -239,10 +239,17 @@
 <code>$headers = $this->input->request_headers();</code>
 
 <h2>$this->input->get_request_header();</h2>
-<p>Returns a single 
+<p>Returns a single member of the request headers array.</p>
 
 <code>$this->input->get_request_header('some-header', TRUE);</code>
 
+
+<h2>$this->input->is_ajax_request()</h2>
+<p>Checks to see if the <var>HTTP_X_REQUESTED_WITH</var> server header has been set, and returns a boolean response.</p>
+
+<code>$this->input->is_ajax_request()</code>
+
+
 </div>
 <!-- END CONTENT -->