--- a/Overview.htm	Tue Dec 10 01:19:16 2013 +0900
+++ b/Overview.htm	Tue Dec 10 01:20:10 2013 +0900
@@ -481,7 +481,7 @@
 					</p>
 				</dd>
 
-				<dt>Promise&amp;lt;undefined&gt; writeAbort(any reason)</dt>
+				<dt>Promise&amp;lt;undefined&gt; writeAbort(optional any reason)</dt>
 				<dd>
 					<p>
 						This method tells the WritableByteStream that no more data will be written to it with indication of error.
@@ -1031,7 +1031,7 @@
 					</p>
 				</dd>
 
-				<dt>Promise&amp;lt;undefined&gt; readAbort(any reason)</dt>
+				<dt>Promise&amp;lt;undefined&gt; readAbort(optional any reason)</dt>
 				<dd>
 					<p>
 						This method tells the ReadableByteStream that no more data will be read from it with indication of error.