diff --git a/README.txt b/README.txt
index 15de86c..cb008be 100644
--- a/README.txt
+++ b/README.txt
@@ -65,7 +65,8 @@ API OVERVIEW
 
 Issue HTTP Requests:
 httprl_build_url_self()
- - Helper function to build an URL for asynchronous requests to self.
+ - Helper function to build an URL for asynchronous requests to self. Note that
+   you should set the Host name in the headers when using this.
 httprl_request()
  - Queue up a HTTP request in httprl_send_request().
 httprl_send_request()
@@ -141,13 +142,19 @@ Request http://drupal.org/robots.txt and save it to tmp folder.
 Request this servers own front page & the node page.
 
     <?php
+    $options = array(
+      'headers' => array(
+        // Set the Host header to self.
+        'Host' => $_SERVER['HTTP_HOST'],
+      ),
+    );
     // Build URL to point to front page of this server.
     $url_front = httprl_build_url_self();
     // Build URL to point to /node on this server.
     $url_node = httprl_build_url_self('node');
     // Queue up the requests.
-    httprl_request($url_front);
-    httprl_request($url_node);
+    httprl_request($url_front, $options);
+    httprl_request($url_node, $options);
     // Execute requests.
     $request = httprl_send_request();
 
@@ -165,6 +172,10 @@ this should generate 10 404s and the $request object won't contain much info.
     // Set the blocking mode.
     $options = array(
       'blocking' => FALSE,
+      'headers' => array(
+        // Set the Host header to self.
+        'Host' => $_SERVER['HTTP_HOST'],
+      ),
     );
     // Queue up the requests.
     $max = 10;
@@ -189,6 +200,10 @@ URLs will all have the same options.
     $options = array(
       'method' => 'HEAD',
       'blocking' => FALSE,
+      'headers' => array(
+        // Set the Host header to self.
+        'Host' => $_SERVER['HTTP_HOST'],
+      ),
     );
     // Queue up the requests.
     $max = 10;
@@ -218,6 +233,10 @@ connections that couldn't be made will be dropped.
       'blocking' => FALSE,
       'domain_connections' => 1000,
       'global_connections' => 1000,
+      'headers' => array(
+        // Set the Host header to self.
+        'Host' => $_SERVER['HTTP_HOST'],
+      ),
     );
     // Queue up the requests.
     $max = 1000;
@@ -251,6 +270,10 @@ connection to be established; `async_connect` is FALSE.
       // clients.
       'domain_connections' => 32,
       'global_connections' => 1000,
+      'headers' => array(
+        // Set the Host header to self.
+        'Host' => $_SERVER['HTTP_HOST'],
+      ),
     );
     // Queue up the requests.
     $max = 1000;
@@ -286,6 +309,10 @@ we are going to use httprl_pr() as the callback function.
           'return' => &$x,
         ),
       ),
+      'headers' => array(
+        // Set the Host header to self.
+        'Host' => $_SERVER['HTTP_HOST'],
+      ),
     );
     // Build URL to point to front page of this server.
     $url_front = httprl_build_url_self();
@@ -315,6 +342,10 @@ background callback creates a new thread to run this function in.
           'return' => &$x,
         ),
       ),
+      'headers' => array(
+        // Set the Host header to self.
+        'Host' => $_SERVER['HTTP_HOST'],
+      ),
     );
     // Build URL to point to front page of this server.
     $url_front = httprl_build_url_self();
@@ -349,6 +380,10 @@ instead of returning a value.
         ),
         FALSE,
       ),
+      'headers' => array(
+        // Set the Host header to self.
+        'Host' => $_SERVER['HTTP_HOST'],
+      ),
     );
     // Build URL to point to front page of this server.
     $url_front = httprl_build_url_self();
@@ -425,8 +460,6 @@ the first and last 128 bytes are returned.
 Send 2 files in one field via a POST request.
 
     <?php
-    // Send request to front page.
-    $url_front = httprl_build_url_self();
     // Set options.
     $options = array(
       'method' => 'POST',
@@ -441,7 +474,14 @@ Send 2 files in one field via a POST request.
           ),
         ),
       ),
+      'headers' => array(
+        // Set the Host header to self.
+        'Host' => $_SERVER['HTTP_HOST'],
+      ),
     );
+    // Send request to front page.
+    $url_front = httprl_build_url_self();
+
     // Queue up the request.
     httprl_request($url_front, $options);
     // Execute request.