--- a/Overview.htm	Mon Dec 02 19:20:20 2013 +0900
+++ b/Overview.htm	Mon Dec 02 20:19:58 2013 +0900
@@ -784,6 +784,10 @@
 						</ol>
 					</p>
 
+					<p>
+						<img src="fulfilling.png" alt="How new data is automatically fetched">
+					</p>
+
 					<section class="note">
 						This method is useful if
 						<ol>
@@ -1045,6 +1049,10 @@
 			</p>
 
 			<p>
+				<img src="readdatabuffer.png" alt="Read data buffer related variables">
+			</p>
+
+			<p>
 				An associated flag <dfn>eofReached</dfn> which indicates that the EOF was received from the <a>dataSource</a>.
 			</p>
 
@@ -1069,6 +1077,10 @@
 			</p>
 
 			<p>
+				<img src="increasing_pullamount.png" alt="When pullAmount is increased, new data will be fetched">
+			</p>
+
+			<p>
 				When the EOF is received from <a>dataSource</a>, queue a task which sets <a>eofReached</a>.
 			</p>
 

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