diff --git a/lib/Gitlab/Api/MergeRequests.php b/lib/Gitlab/Api/MergeRequests.php
index d7b4ebb2e..b8a3c8f46 100644
--- a/lib/Gitlab/Api/MergeRequests.php
+++ b/lib/Gitlab/Api/MergeRequests.php
@@ -69,6 +69,8 @@ public function all($project_id, array $parameters = [])
             ->setNormalizer('created_before', $datetimeNormalizer)
         ;
         $resolver->setDefined('search');
+        $resolver->setDefined('source_branch');
+        $resolver->setDefined('target_branch');
         
         return $this->get($this->getProjectPath($project_id, 'merge_requests'), $resolver->resolve($parameters));
     }
@@ -185,21 +187,27 @@ public function addComment($project_id, $mr_id, $note)
     /**
      * @param int $project_id
      * @param int $mr_id
+     * @param array $parameters
      * @return mixed
      */
-    public function changes($project_id, $mr_id)
+    public function changes($project_id, $mr_id, array $parameters = [])
     {
-        return $this->get($this->getProjectPath($project_id, 'merge_requests/'.$this->encodePath($mr_id).'/changes'));
+        $resolver = $this->createOptionsResolver();
+
+        return $this->get($this->getProjectPath($project_id, 'merge_requests/'.$this->encodePath($mr_id).'/changes'), $resolver->resolve($parameters));
     }
 
     /**
      * @param int $project_id
      * @param int $mr_id
+     * @param array $parameters
      * @return mixed
      */
-    public function commits($project_id, $mr_id)
+    public function commits($project_id, $mr_id, array $parameters = [])
     {
-        return $this->get($this->getProjectPath($project_id, 'merge_requests/'.$this->encodePath($mr_id).'/commits'));
+        $resolver = $this->createOptionsResolver();
+
+        return $this->get($this->getProjectPath($project_id, 'merge_requests/'.$this->encodePath($mr_id).'/commits'), $resolver->resolve($parameters));
     }
 
     /**
@@ -255,4 +263,18 @@ public function awardEmoji($project_id, $merge_request_iid)
     {
         return $this->get($this->getProjectPath($project_id, 'merge_requests/'.$this->encodePath($merge_request_iid).'/award_emoji'));
     }
+
+    /**
+     * @param int $project_id
+     * @param int $merge_request_iid
+     * @param array $parameters
+     *
+     * @return mixed
+     */
+    public function pipelines($project_id, $merge_request_iid, array $parameters = [])
+    {
+        $resolver = $this->createOptionsResolver();
+
+        return $this->get($this->getProjectPath($project_id, 'merge_requests/'.$this->encodePath($merge_request_iid).'/pipelines'), $resolver->resolve($parameters));
+    }
 }