diff --git a/README.md b/README.md
index 674aa4e..a3e4d35 100644
--- a/README.md
+++ b/README.md
@@ -34,9 +34,9 @@ api = TestApi()
 posts = api.posts()
 post = api.post(id=posts[0]['id'])
 comments = api.comments(id=post['id'])
-new_post_id = api.add_post(userId=1,
-                           title='Breaking news',
-                           body='I just got devoured.')
+new_post_id = api.add_post(data={'userId': 1,
+                                 'title': 'Breaking news',
+                                 'body': 'I just got devoured.'})
 try:
     post = api.post(id=new_post_id)
 except APIError:
@@ -47,6 +47,11 @@ The init function gives details so you don't need to repeat them elsewhere, enab
 raising exceptions on error. You can also obtain raw string with `load_json=False` and silence errors getting
 None instead when they happen with `throw_on_error=False`.
 
+When calling methods:
+* `data` and `payload` kwargs will be passed to requests call as `data` and `json` parameters.
+* all keyword arguments matching schema will be used in schema.
+* all other kwargs will be passed to requests call as query string parameters.
+
 ### Async usage
 
 Devourer supports asynchronous calls using concurrent.futures's ThreadPoolExecutor. API subclasses
diff --git a/devourer/api.py b/devourer/api.py
index 10d7a8b..dd1599f 100644
--- a/devourer/api.py
+++ b/devourer/api.py
@@ -105,7 +105,7 @@ def params(self):
         """
         return self._params
 
-    def __call__(self, api, payload=None, **kwargs):
+    def __call__(self, api, payload=None, data=None, **kwargs):
         """
         This method sends a request to API through invoke function from API object
         the method is assigned to. It calls invoke with formatted schema, additional
@@ -113,6 +113,7 @@ def __call__(self, api, payload=None, **kwargs):
 
         :param kwargs: Additional parameters to be passed to remote API.
         :param payload: The POST body to send along with the request as JSON.
+        :param data: Dict or encoded string to be sent as request body.
         :returns: API request's result.
         """
         params = {key: value for key, value in kwargs.items() if key not in self.params}
@@ -120,7 +121,7 @@ def __call__(self, api, payload=None, **kwargs):
             schema = self.schema.format(**kwargs)
         else:
             schema = self.schema
-        return api.invoke(self.http_method, schema, params=params, payload=payload)
+        return api.invoke(self.http_method, schema, params=params, data=data, payload=payload)
 
 
 class GenericAPICreator(type):
@@ -255,17 +256,18 @@ def outer_call(cls, name):
         """
         return lambda obj, *args, **kwargs: obj.call(name, *args, **kwargs)
 
-    def invoke(self, http_method, url, params, payload):
+    def invoke(self, http_method, url, params, data=None, payload=None):
         """
         This method makes a request to given API address concatenating the method
         path and passing along authentication data.
 
         :param http_method: http method to be used for this call.
         :param url: exact address to be concatenated to API address.
+        :param data: dict or encoded string to be sent as request body.
         :param payload: the payload dictionary to be sent in body of the request, encoded as JSON.
         :returns: response object as in requests.
         """
-        return getattr(requests, http_method)(self.url + url, auth=self.auth, params=params, json=payload)
+        return getattr(requests, http_method)(self.url + url, auth=self.auth, params=params, data=data, json=payload)
 
 
 class GenericAPI(with_metaclass(GenericAPICreator, GenericAPIBase)):
diff --git a/setup.cfg b/setup.cfg
index 224a779..b88034e 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,2 +1,2 @@
 [metadata]
-description-file = README.md
\ No newline at end of file
+description-file = README.md
diff --git a/setup.py b/setup.py
index 9eb3557..3e8eb11 100644
--- a/setup.py
+++ b/setup.py
@@ -3,7 +3,7 @@
 setup(
     name='devourer',
     packages=['devourer'],
-    version='0.4.0',
+    version='0.4.1',
     install_requires=[
         'requests',
         'futures',
@@ -14,7 +14,7 @@
     author='Bonnier Business Polska / Krzysztof Bujniewicz',
     author_email='racech@gmail.com',
     url='https://github.com/bonnierpolska/devourer',
-    download_url='https://github.com/bonnierpolska/devourer/tarball/0.4.0',
+    download_url='https://github.com/bonnierpolska/devourer/tarball/0.4.1',
     keywords=['api', 'generic api', 'api client'],
     classifiers=[]
 )