diff --git a/Trustly/Data/data.php b/Trustly/Data/data.php
index a77274b..1467e9d 100644
--- a/Trustly/Data/data.php
+++ b/Trustly/Data/data.php
@@ -128,6 +128,8 @@ public static function ensureUTF8($str) {
 	 * @param string $name
 	 *
 	 * @param mixed $value
+	 *
+	 * @return void
 	 */
 	public function set($name, $value) {
 		$this->payload[$name] = Trustly_Data::ensureUTF8($value);
diff --git a/Trustly/Data/jsonrpcrequest.php b/Trustly/Data/jsonrpcrequest.php
index 2b10f9a..305334c 100644
--- a/Trustly/Data/jsonrpcrequest.php
+++ b/Trustly/Data/jsonrpcrequest.php
@@ -163,10 +163,10 @@ public function getUUID() {
 	 *
 	 * @param string $method The name of the API method this call is for
 	 *
-	 * @return string $method
+	 * @return void
 	 */
 	public function setMethod($method) {
-		return $this->set('method', $method);
+		$this->set('method', $method);
 	}