diff --git a/src/UserData/Extractor/ExtractorInterface.php b/src/UserData/Extractor/ExtractorInterface.php
index <HASH>..<HASH> 100644
--- a/src/UserData/Extractor/ExtractorInterface.php
+++ b/src/UserData/Extractor/ExtractorInterface.php
@@ -56,7 +56,7 @@ interface ExtractorInterface {
 	/**

 	 * Get service id

 	 *

-	 * @return string

+	 * @return string String, like "google" or "facebook"

 	 * @throws Exception

 	 */

 	public function getServiceId();
Updated phpdoc for ExtractorInterface::getServiceId()