diff --git a/httprl.module b/httprl.module
index 531bdcb..803d206 100644
--- a/httprl.module
+++ b/httprl.module
@@ -399,11 +399,11 @@ function httprl_request($url, $options = array()) {
   // Merge the default headers.
   // Set user agent to drupal.
   // Set connection to closed to prevent keep-alive from causing a timeout.
-  // Set referrer to current page.
   $options['headers'] += array(
     'User-Agent' => 'Drupal (+http://drupal.org/)',
     'Connection' => 'close',
   );
+  // Set referrer to current page.
   if (!isset($options['headers']['Referer']) && !empty($options['referrer'])) {
     $options['headers']['Referer'] = $base_root . request_uri();
   }
@@ -506,11 +506,11 @@ function httprl_send_request($fp = NULL, $url = '', $request = '', $options = ''
   $stream_select_timeout = 1;
   while (!empty($streams)) {
 
-    // Check for timeouts.
+    // Get time.
     $current_time = timer_read($timer_name) / 1000;
     $global_time = $global_timeout - timer_read($timer_name) / 1000;
 
-    // Set connection limits.
+    // Initialize connection limits.
     $this_run = array();
     $global_connection_count = 0;
     $domain_connection_count = array();
@@ -578,6 +578,7 @@ function httprl_send_request($fp = NULL, $url = '', $request = '', $options = ''
         }
       }
 
+      // Set the connection limits for this run.
       // Get the host name.
       $host = $responses[$id]->options['headers']['Host'];
       // Count up the number of connections.
@@ -602,7 +603,8 @@ function httprl_send_request($fp = NULL, $url = '', $request = '', $options = ''
     // Set the read and write vars to the streams var.
     $read = $write = $this_run;
     $except = array();
-    // Do some voodoo and open all streams at once. Wait 25ms for streams to respond.
+    // Do some voodoo and open all streams at once. Wait 25ms for streams to
+    // respond.
     $n = stream_select($read, $write, $except, $stream_select_timeout, 25000);
     $stream_select_timeout = 0;
 
@@ -611,7 +613,8 @@ function httprl_send_request($fp = NULL, $url = '', $request = '', $options = ''
     if (!empty($n)) {
       $empty_runs = 0;
 
-      // Readable sockets either have data for us, or are failed connection attempts.
+      // Readable sockets either have data for us, or are failed connection
+      // attempts.
       foreach ($read as $r) {
         $id = array_search($r, $streams);
         // Make sure ID is in the streams.
@@ -641,7 +644,8 @@ function httprl_send_request($fp = NULL, $url = '', $request = '', $options = ''
           // See if the headers are in the data stream.
           httprl_parse_data($responses[$id]);
           if (!empty($responses[$id]->headers)) {
-            // Stream was a redirect, close this connection; redirect is being followed.
+            // Stream was a redirect, close this connection; redirect is being
+            // followed.
             if (!empty($responses[$id]->redirect_url)) {
               $responses[$id]->status = 'Done.';
               fclose($r);
@@ -675,6 +679,7 @@ function httprl_send_request($fp = NULL, $url = '', $request = '', $options = ''
       if ($stream_write_count > 0) {
         foreach ($write as $w) {
           $id = array_search($w, $streams);
+          // Make sure ID is in the streams & staus is for writing.
           if ($id === FALSE || empty($responses[$id]->status) || $responses[$id]->status != 'in progress') {
             continue;
           }
@@ -1080,6 +1085,7 @@ function httprl_decode_data(&$result) {
  *  int - Content length.
  */
 function httprl_background_processing($output, $wait = TRUE, $content_type = "text/html; charset=utf-8", $length = 0) {
+  // Can't do background processing if headers are already sent.
   if (headers_sent()) {
     return FALSE;
   }