diff --git a/lib/Ratchet/Protocol/WebSocket/FrameInterface.php b/lib/Ratchet/Protocol/WebSocket/FrameInterface.php
new file mode 100644
index 0000000..5b500e5
--- /dev/null
+++ b/lib/Ratchet/Protocol/WebSocket/FrameInterface.php
@@ -0,0 +1,55 @@
+<?php
+namespace Ratchet\Protocol\WebSocket;
+
+interface FrameInterface {
+    /**
+     * @return bool
+     */
+    function isCoalesced();
+
+    /**
+     * @param string
+     */
+    function addBuffer($buf);
+
+    /**
+     * @return bool
+     */
+    function isFragment();
+
+    /**
+     * @return bool
+     */
+    function isFinial();
+
+    /**
+     * @return bool
+     */
+    function isMasked();
+
+    /**
+     * @return int
+     */
+    function getOpcode();
+
+    /**
+     * @return int
+     */
+    function getPayloadLength();
+
+    /**
+     * @return int
+     */
+    function getReceivedPayloadLength();
+
+    /**
+     * 32-big string
+     * @return string
+     */
+    function getMaskingKey();
+
+    /**
+     * @param string
+     */
+    function getPayload();
+}
\ No newline at end of file
diff --git a/lib/Ratchet/Protocol/WebSocket/MessageInterface.php b/lib/Ratchet/Protocol/WebSocket/MessageInterface.php
new file mode 100644
index 0000000..9053fb2
--- /dev/null
+++ b/lib/Ratchet/Protocol/WebSocket/MessageInterface.php
@@ -0,0 +1,32 @@
+<?php
+namespace Ratchet\Protocol\WebSocket;
+
+/**
+ * @todo Consider making parent interface/composite for Message/Frame with (isCoalesced, getOpcdoe, getPayloadLength, getPayload)
+ */
+interface MessageInterface {
+    /**
+     * @return bool
+     */
+    function isCoalesced();
+
+    /**
+     * @param FragmentInterface
+     */
+    function addFragment(FragmentInterface $fragment);
+
+    /**
+     * @return int
+     */
+    function getOpcode();
+
+    /**
+     * @return int
+     */
+    function getPayloadLength();
+
+    /**
+     * @return string
+     */
+    function getPayload();
+}
\ No newline at end of file