diff --git a/requests/api.py b/requests/api.py
index 16fd1e94..70ce375d 100644
--- a/requests/api.py
+++ b/requests/api.py
@@ -19,7 +19,7 @@ def request(method, url, **kwargs):
     :param method: method for the new :class:`Request` object.
     :param url: URL for the new :class:`Request` object.
     :param params: (optional) Dictionary or bytes to be sent in the query string for the :class:`Request`.
-    :param data: (optional) Dictionary, bytes, or file-like object to send in the body of the :class:`Request`.
+    :param data: (optional) Dictionary (will be form-encoded), bytes, or file-like object to send in the body of the :class:`Request`.
     :param json: (optional) json data to send in the body of the :class:`Request`.
     :param headers: (optional) Dictionary of HTTP Headers to send with the :class:`Request`.
     :param cookies: (optional) Dict or CookieJar object to send with the :class:`Request`.
@@ -100,7 +100,7 @@ def post(url, data=None, json=None, **kwargs):
     """Sends a POST request.
 
     :param url: URL for the new :class:`Request` object.
-    :param data: (optional) Dictionary, bytes, or file-like object to send in the body of the :class:`Request`.
+    :param data: (optional) Dictionary (will be form-encoded), bytes, or file-like object to send in the body of the :class:`Request`.
     :param json: (optional) json data to send in the body of the :class:`Request`.
     :param \*\*kwargs: Optional arguments that ``request`` takes.
     :return: :class:`Response <Response>` object
@@ -114,7 +114,7 @@ def put(url, data=None, **kwargs):
     """Sends a PUT request.
 
     :param url: URL for the new :class:`Request` object.
-    :param data: (optional) Dictionary, bytes, or file-like object to send in the body of the :class:`Request`.
+    :param data: (optional) Dictionary (will be form-encoded), bytes, or file-like object to send in the body of the :class:`Request`.
     :param json: (optional) json data to send in the body of the :class:`Request`.
     :param \*\*kwargs: Optional arguments that ``request`` takes.
     :return: :class:`Response <Response>` object
@@ -128,7 +128,7 @@ def patch(url, data=None, **kwargs):
     """Sends a PATCH request.
 
     :param url: URL for the new :class:`Request` object.
-    :param data: (optional) Dictionary, bytes, or file-like object to send in the body of the :class:`Request`.
+    :param data: (optional) Dictionary (will be form-encoded), bytes, or file-like object to send in the body of the :class:`Request`.
     :param json: (optional) json data to send in the body of the :class:`Request`.
     :param \*\*kwargs: Optional arguments that ``request`` takes.
     :return: :class:`Response <Response>` object