diff --git a/tests/test_core.py b/tests/test_core.py
index b824f86..a7cb81c 100644
--- a/tests/test_core.py
+++ b/tests/test_core.py
@@ -213,14 +213,14 @@ class TwythonAPITestCase(unittest.TestCase):
 
         self.assertEqual({'id': 210462857140252672}, data)
 
-    @responses.activate
-    def test_request_should_raise_exception_with_invalid_json(self):
-        """Test that Twython handles invalid JSON (though Twitter should not return it)"""
-        endpoint = 'statuses/show'
-        url = self.get_url(endpoint)
-        self.register_response(responses.GET, url, body='{"id: 210462857140252672}')
+    #@responses.activate
+    #def test_request_should_raise_exception_with_invalid_json(self):
+        #"""Test that Twython handles invalid JSON (though Twitter should not return it)"""
+        #endpoint = 'statuses/show'
+        #url = self.get_url(endpoint)
+        #self.register_response(responses.GET, url, body='{"id: 210462857140252672}')
 
-        self.assertRaises(TwythonError, self.api.request, endpoint, params={'id': 210462857140252672})
+        #self.assertRaises(TwythonError, self.api.request, endpoint, params={'id': 210462857140252672})
 
     @responses.activate
     def test_request_should_handle_401(self):
diff --git a/twython/api.py b/twython/api.py
index 2782168..dedf6c6 100644
--- a/twython/api.py
+++ b/twython/api.py
@@ -140,8 +140,11 @@ class Twython(EndpointsMixin, object):
         params = params or {}
 
         func = getattr(self.client, method)
-        params, files = _transparent_params(params)
-
+        if type(params) is dict:
+            params, files = _transparent_params(params)
+        else:
+            params = params
+            files = list()
         requests_args = {}
         for k, v in self.client_args.items():
             # Maybe this should be set as a class variable and only done once?
@@ -199,8 +202,10 @@ class Twython(EndpointsMixin, object):
             else:
                 content = response.json()
         except ValueError:
-            raise TwythonError('Response was not valid JSON. \
-                               Unable to decode.')
+            # Send the response as is for working with /media/metadata/create.json.
+            content = response.content
+            #raise TwythonError('Response was not valid JSON. \
+                               #Unable to decode.')
 
         return content
 
diff --git a/twython/endpoints.py b/twython/endpoints.py
index 95e33d2..3cd0205 100644
--- a/twython/endpoints.py
+++ b/twython/endpoints.py
@@ -22,7 +22,7 @@ from time import sleep
     #from StringIO import StringIO
 #except ImportError:
     #from io import StringIO
-
+import json
 from .advisory import TwythonDeprecationWarning
 
 
@@ -238,6 +238,14 @@ class EndpointsMixin(object):
 
         return response
 
+    def set_description(self, **params):
+        """ Adds a description to an image.
+        Docs: there is no official documentation
+        """
+        # This method only accepts strings, no dictionaries.
+        params = json.dumps(params)
+        return self.post("media/metadata/create", params=params)
+
     def get_oembed_tweet(self, **params):
         """Returns information allowing the creation of an embedded
         representation of a Tweet on third party sites.