diff --git a/src/IncomingRequestInterface.php b/src/IncomingRequestInterface.php
new file mode 100644
index 0000000..e747f96
--- /dev/null
+++ b/src/IncomingRequestInterface.php
@@ -0,0 +1,137 @@
+<?php
+
+namespace Psr\Http\Message;
+
+/**
+ * An incoming (server-side) HTTP request.
+ *
+ * This interface further describes a server-side request and provides
+ * accessors and mutators around common request data, such as query
+ * string arguments, body parameters, upload file metadata, cookies, and
+ * matched routing parameters.
+ */
+interface IncomingRequestInterface extends RequestInterface
+{
+    /**
+     * Retrieve cookies.
+     *
+     * Retrieves cookies sent by the client to the server.
+     *
+     * The assumption is these are injected during instantiation, typically
+     * from PHP's $_COOKIE superglobal, and should remain immutable over the
+     * course of the incoming request.
+     *
+     * The return value can be either an array or an object that acts like
+     * an array (e.g., implements ArrayAccess, or an ArrayObject).
+     * 
+     * @return array|\ArrayAccess
+     */
+    public function getCookieParams();
+
+    /**
+     * Set cookie parameters.
+     *
+     * Allows a library to set the cookie parameters. Use cases include
+     * libraries that implement additional security practices, such as
+     * encrypting or hashing cookie values; in such cases, they will read
+     * the original value, filter them, and re-inject into the incoming
+     * request..
+     *
+     * The value provided should be an array or array-like object
+     * (e.g., implements ArrayAccess, or an ArrayObject).
+     * 
+     * @param array|\ArrayAccess $cookies Cookie values/structs
+     * 
+     * @return void
+     */
+    public function setCookieParams($cookies);
+
+    /**
+     * Retrieve query string arguments.
+     *
+     * Retrieves the deserialized query string arguments, if any.
+     *
+     * The assumption is these are injected during instantiation, typically
+     * from PHP's $_GET superglobal, and should remain immutable over the
+     * course of the incoming request.
+     *
+     * The return value can be either an array or an object that acts like
+     * an array (e.g., implements ArrayAccess, or an ArrayObject).
+     * 
+     * @return array
+     */
+    public function getQueryParams();
+
+    /**
+     * Retrieve the upload file metadata.
+     *
+     * This method should return file upload metadata in the same structure
+     * as PHP's $_FILES superglobal.
+     *
+     * The assumption is these are injected during instantiation, typically
+     * from PHP's $_FILES superglobal, and should remain immutable over the
+     * course of the incoming request.
+     *
+     * The return value can be either an array or an object that acts like
+     * an array (e.g., implements ArrayAccess, or an ArrayObject).
+     * 
+     * @return array Upload file(s) metadata, if any.
+     */
+    public function getFileParams();
+
+    /**
+     * Retrieve any parameters provided in the request body.
+     *
+     * If the request body can be deserialized, and if the deserialized values
+     * can be represented as an array or object, this method can be used to
+     * retrieve them.
+     *
+     * In other cases, the parent getBody() method should be used to retrieve
+     * the body content.
+     * 
+     * @return array|object The deserialized body parameters, if any. These may
+     *                      be either an array or an object, though an array or
+     *                      array-like object is recommended.
+     */
+    public function getBodyParams();
+
+    /**
+     * Set the request body parameters.
+     *
+     * If the body content can be deserialized, the values obtained may then
+     * be injected into the response using this method. This method will
+     * typically be invoked by a factory marshaling request parameters.
+     * 
+     * @param array|object $values The deserialized body parameters, if any.
+     *                             These may be either an array or an object,
+     *                             though an array or array-like object is
+     *                             recommended.
+     *
+     * @return void
+     */
+    public function setBodyParams($values);
+
+    /**
+     * Retrieve parameters matched during routing.
+     *
+     * If a router or similar is used to match against the path and/or request,
+     * this method can be used to retrieve the results, so long as those
+     * results can be represented as an array or array-like object.
+     *
+     * @return array|\ArrayAccess Path parameters matched by routing
+     */
+    public function getPathParams();
+
+    /**
+     * Set parameters discovered by matching that path
+     *
+     * If a router or similar is used to match against the path and/or request,
+     * this method can be used to inject the request with the results, so long
+     * as those results can be represented as an array or array-like object.
+     * 
+     * @param array|\ArrayAccess $values Path parameters matched by routing
+     *
+     * @return void
+     */
+    public function setPathParams(array $values);
+}
diff --git a/src/MessageInterface.php b/src/MessageInterface.php
index 5fcff95..89e934a 100644
--- a/src/MessageInterface.php
+++ b/src/MessageInterface.php
@@ -17,6 +17,18 @@ interface MessageInterface
      */
     public function getProtocolVersion();
 
+    /**
+     * Set the HTTP protocol version.
+     *
+     * The version string MUST contain only the HTTP version number (e.g.,
+     * "1.1", "1.0").
+     *
+     * @param string $version HTTP protocol version
+     *
+     * @return void
+     */
+    public function setProtocolVersion($version);
+
     /**
      * Gets the body of the message.
      *
diff --git a/src/StreamableInterface.php b/src/StreamableInterface.php
index 4932e5c..f492734 100644
--- a/src/StreamableInterface.php
+++ b/src/StreamableInterface.php
@@ -125,7 +125,8 @@ public function isReadable();
      *                    them. Fewer than $length bytes may be returned if
      *                    underlying stream call returns fewer bytes.
      *
-     * @return string     Returns the data read from the stream.
+     * @return string|false Returns the data read from the stream, false if
+     *                      unable to read or if an error occurs.
      */
     public function read($length);