--- a/preview.html	Wed Nov 06 14:45:46 2013 +0900
+++ b/preview.html	Thu Nov 07 01:19:03 2013 +0900
@@ -379,7 +379,7 @@
 				</p>
 			</dd>
 
-			<dt>Promise read()</dt>
+			<dt>any read()</dt>
 			<dd>
 				<p>
 					This method reads data from the ReadableByteStream.
@@ -388,6 +388,50 @@
 					The user agent must run the steps below (unless otherwise indicated):
 				</p>
 
+				<p>
+					<b>Experimental sync/async hybrid read() method algoritm</b>
+
+					<dl class="switch">
+						<dt>EOF is reached</dt>
+						<dd>
+							<ol>
+								<li>Let <var>result</var> be a <a>ByteStreamConsumeResult</a>.</li>
+								<li>Set eof attribute of <var>result</var> to true.</li>
+								<li>Return <var>result</var>.</li>
+							</ol>
+						</dd>
+						<dt>Otherwise</dt>
+						<dd>
+							<ol>
+								<li>Let <var>result</var> be a <a>ByteStreamConsumeResult</a>.</li>
+								<li>Set eof attribute of <var>result</var> to false.</li>
+								<li>
+									<dl class="switch">
+										<dt>There's any data available to be read synchronously (when readType is "text", also the data need to be decoded to non-empty DOMString)</dt>
+										<dd>
+											<ol>
+												<li>Set size attribute of <var>result</var> to the number of bytes consumed.</li>
+												<li>Set data attribute of <var>result</var> to the read data.</li>
+												<li>Return <var>result</var>.
+											</ol>
+										</dd>
+										<dt>Otherwise</dt>
+										<dd>
+											<ol>
+												<li>Set size attribute of <var>result</var> to 0.</li>
+												<li>Let <var>readPromise</var> be a <a>Promise</a>.</li>
+												<li>Set data attribute of <var>result</var> to a <var>promise</var>.</li>
+												<li>Return <var>result</var>.</li>
+												<li>When data becomes available for read, rerun this algorithm to create a <a>ByteStreamConsumeResult</a> and fulfill <var>promise</var> with it.</li>
+											</ol>
+										</dd>
+									</dl>
+								</li>
+							</ol>
+						</dd>
+					</dl>
+				</p>
+
 				<dl class="parameters">
 					<dt>optional [Clamp] unsigned long long size</dt>
 					<dd>Number of bytes to read.</dd>
@@ -402,13 +446,31 @@
 					Another read() or pipe() call must not be made until the returned <a>Promise</a> is fulfilled or rejected.
 
 					<dl class="parameters">
-						<dt>!(<a>WritableByteStream</a> or <a>WritableByteStream</a>[]) destination</dt>
+						<dt>WritableByteStream destination</dt>
 						<dd>Destination <a>WritableByteStream</a>.</dd>
 						<dt>optional [Clamp] unsigned long long size</dt>
 						<dd>Number of bytes to transfer.</dd>
 					</dl>
 				</p>
 
+				<dt>Promise substream()</dt>
+				<dd>
+					<p>
+						<b>Experimental substream() method, aka fork() method.</b>
+					</p>
+
+					<p>
+						This method creates a clone of the ReadableByteStream which refers to the same internal data sequence.
+						Internal data sequence of the original ReadableByteStream will be reference counted so that a range in the original data sequence is freed only when all the ReadableByteStreams sharing the sequence.
+
+						<dl class="parameters">
+							<dt>in optional [Clamp] unsigned long long size</dt>
+							<dd>Number of bytes to be readable from the new Stream.</dd>
+						</dl>
+					</p>
+				</dd>
+			</dl>
+
 				<p>
 					Note that fulfillment or rejection of the returned Promise doesn't necessarily mean that the data transferred to the destination Stream has been successfully read from the Stream.
 				</p>