diff --git a/phpFlickr.php b/phpFlickr.php
index 57dcf9b..dfaced8 100644
--- a/phpFlickr.php
+++ b/phpFlickr.php
@@ -225,6 +225,7 @@ function post ($data, $type = null) {
 				curl_setopt($curl, CURLOPT_POST, true);
 				curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
 				curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
+				curl_setopt($curl, CURLOPT_USERAGENT, 'PHP_Flickr/3.11');
 				$response = curl_exec($curl);
 				curl_close($curl);
 			} else {
@@ -240,6 +241,7 @@ function post ($data, $type = null) {
 				}
 				fputs ($fp,'POST ' . $matches[2] . " HTTP/1.1\n");
 				fputs ($fp,'Host: ' . $matches[1] . "\n");
+				fputs ($fp, 'User-Agent: PHP_Flickr/3.11' . "\n");
 				fputs ($fp,"Content-type: application/x-www-form-urlencoded\n");
 				fputs ($fp,"Content-length: ".strlen($data)."\n");
 				fputs ($fp,"Connection: close\r\n\r\n");