diff --git a/README.md b/README.md
index 5d44199c..ba7c5cf9 100644
--- a/README.md
+++ b/README.md
@@ -123,10 +123,10 @@ offers several methods that resemble the HTTP protocol methods:
 ```php
 $browser->get($url, array $headers = array());
 $browser->head($url, array $headers = array());
-$browser->post($url, array $headers = array(), string|ReadableStreamInterface $contents = '');
-$browser->delete($url, array $headers = array(), string|ReadableStreamInterface $contents = '');
-$browser->put($url, array $headers = array(), string|ReadableStreamInterface $contents = '');
-$browser->patch($url, array $headers = array(), string|ReadableStreamInterface $contents = '');
+$browser->post($url, array $headers = array(), string|ReadableStreamInterface $body = '');
+$browser->delete($url, array $headers = array(), string|ReadableStreamInterface $body = '');
+$browser->put($url, array $headers = array(), string|ReadableStreamInterface $body = '');
+$browser->patch($url, array $headers = array(), string|ReadableStreamInterface $body = '');
 ```
 
 Each of these methods requires a `$url` and some optional parameters to send an
@@ -1921,7 +1921,7 @@ See also [GET request client example](examples/01-client-get-request.php).
 
 #### post()
 
-The `post(string $url, array $headers = array(), string|ReadableStreamInterface $contents = ''): PromiseInterface<ResponseInterface>` method can be used to
+The `post(string $url, array $headers = array(), string|ReadableStreamInterface $body = ''): PromiseInterface<ResponseInterface>` method can be used to
 send an HTTP POST request.
 
 ```php
@@ -1983,7 +1983,7 @@ $browser->head($url)->then(function (Psr\Http\Message\ResponseInterface $respons
 
 #### patch()
 
-The `patch(string $url, array $headers = array(), string|ReadableStreamInterface $contents = ''): PromiseInterface<ResponseInterface>` method can be used to
+The `patch(string $url, array $headers = array(), string|ReadableStreamInterface $body = ''): PromiseInterface<ResponseInterface>` method can be used to
 send an HTTP PATCH request.
 
 ```php
@@ -2015,7 +2015,7 @@ $browser->patch($url, array('Content-Length' => '11'), $body);
 
 #### put()
 
-The `put(string $url, array $headers = array()): PromiseInterface<ResponseInterface>` method can be used to
+The `put(string $url, array $headers = array(), string|ReadableStreamInterface $body = ''): PromiseInterface<ResponseInterface>` method can be used to
 send an HTTP PUT request.
 
 ```php
@@ -2049,7 +2049,7 @@ $browser->put($url, array('Content-Length' => '11'), $body);
 
 #### delete()
 
-The `delete(string $url, array $headers = array()): PromiseInterface<ResponseInterface>` method can be used to
+The `delete(string $url, array $headers = array(), string|ReadableStreamInterface $body = ''): PromiseInterface<ResponseInterface>` method can be used to
 send an HTTP DELETE request.
 
 ```php
diff --git a/src/Browser.php b/src/Browser.php
index 5879b977..657b43b0 100644
--- a/src/Browser.php
+++ b/src/Browser.php
@@ -162,12 +162,12 @@ public function get($url, array $headers = array())
      *
      * @param string                         $url      URL for the request.
      * @param array                          $headers
-     * @param string|ReadableStreamInterface $contents
+     * @param string|ReadableStreamInterface $body
      * @return PromiseInterface<ResponseInterface>
      */
-    public function post($url, array $headers = array(), $contents = '')
+    public function post($url, array $headers = array(), $body = '')
     {
-        return $this->requestMayBeStreaming('POST', $url, $headers, $contents);
+        return $this->requestMayBeStreaming('POST', $url, $headers, $body);
     }
 
     /**
@@ -220,12 +220,12 @@ public function head($url, array $headers = array())
      *
      * @param string                         $url      URL for the request.
      * @param array                          $headers
-     * @param string|ReadableStreamInterface $contents
+     * @param string|ReadableStreamInterface $body
      * @return PromiseInterface<ResponseInterface>
      */
-    public function patch($url, array $headers = array(), $contents = '')
+    public function patch($url, array $headers = array(), $body = '')
     {
-        return $this->requestMayBeStreaming('PATCH', $url , $headers, $contents);
+        return $this->requestMayBeStreaming('PATCH', $url , $headers, $body);
     }
 
     /**
@@ -262,12 +262,12 @@ public function patch($url, array $headers = array(), $contents = '')
      *
      * @param string                         $url      URL for the request.
      * @param array                          $headers
-     * @param string|ReadableStreamInterface $contents
+     * @param string|ReadableStreamInterface $body
      * @return PromiseInterface<ResponseInterface>
      */
-    public function put($url, array $headers = array(), $contents = '')
+    public function put($url, array $headers = array(), $body = '')
     {
-        return $this->requestMayBeStreaming('PUT', $url, $headers, $contents);
+        return $this->requestMayBeStreaming('PUT', $url, $headers, $body);
     }
 
     /**
@@ -281,12 +281,12 @@ public function put($url, array $headers = array(), $contents = '')
      *
      * @param string                         $url      URL for the request.
      * @param array                          $headers
-     * @param string|ReadableStreamInterface $contents
+     * @param string|ReadableStreamInterface $body
      * @return PromiseInterface<ResponseInterface>
      */
-    public function delete($url, array $headers = array(), $contents = '')
+    public function delete($url, array $headers = array(), $body = '')
     {
-        return $this->requestMayBeStreaming('DELETE', $url, $headers, $contents);
+        return $this->requestMayBeStreaming('DELETE', $url, $headers, $body);
     }
 
     /**