--- a/Overview.htm	Wed Jan 29 20:14:44 2014 +0900
+++ b/Overview.htm	Wed Jan 29 20:20:41 2014 +0900
@@ -1809,6 +1809,7 @@
 
 		<p>
 			<dfn>Promise</dfn> is defined in <a href="https://github.com/domenic/promises-unwrapping/blob/master/README.md">Promise Objects specification</a>.
+			Shorthand phrases to refer operations on Promises are borrowed from <a href="https://github.com/w3ctag/promises-guide">Writing Promise-Using Specifications</a>.
 		</p>
 
 		<p>