--- a/608toVTT/608toVTT.html	Sat Nov 10 21:27:34 2012 +1100
+++ b/608toVTT/608toVTT.html	Sun Nov 11 00:29:14 2012 +1100
@@ -869,12 +869,21 @@
       <section>
         <h2>Roll-up Captions</h2>
         <p>
-          CEA-608 roll-up caption mode display 2, 3, or 4 rows of captions into which old lines are scrolled as new lines are added below. Scrolling up a line must take no more than 0.433 sec.
+          CEA-608 roll-up caption mode display 2, 3, or 4 rows of captions into which old lines are scrolled as new lines are added below. Scrolling up a line must take no more than 0.433 sec. CEA-708 roll-up captions may have any number of lines.
         </p>
 
         <p>
-          The roll-up display mode is translated to WebVTT by providing cues that overlap in time. As a second cue comes on, the first one scrolls up one line and the new one is added below. (Note: this has not yet been resolved fully and is not accurate at time of writing.) The translation software will ascertain that the cue intervals are appropriately timed such that at most 4 rows of captions are shown at one time.
+          Both CEA-608 and CEA-708 captions are mapped to WebVTT through definition of a Region. In CEA-708 that Region is defined by the Caption Window. For CEA-608 we define a rollup Region as follows with n being the number of rows:
         </p>
+        <pre>
+Region: id=rollup width=80% height=n scroll=up regionanchor=0%,100% viewportanchor=10%,90% start=bottom
+        </pre>
+
+        <p>
+          The roll-up display mode is translated to WebVTT by providing cues that overlap in time. As a second cue comes on, the first one scrolls up one line and the new one is added below. The translation software will ascertain that the cue intervals are appropriately timed such that at most n rows of captions are shown at one time.
+        </p>
+
+        <p>
       </section>
 
       <section>
@@ -937,11 +946,11 @@
       <section>
         <h2>Character Codes</h2>
         <p>
-          In CEA-608, there are captions rendered from 3 different sets of character codes. In 708 it is unicode.
+          In CEA-608, there are captions rendered from 3 different sets of character codes. In 708 the printable characters in use are ASCII with the substitution of the music note character for the ASCII DEL character, LATIN-1, and an extended character set.
         </p>
 
         <p>
-          WebVTT uses only unicode code points, rendered as UTF-8 characters. All of the CEA-608 character codes - both the standard and the extended character codes - are mapped to unicode.
+          WebVTT uses only unicode code points, rendered as UTF-8 characters. All of the CEA-608 and CEA-708 character codes - standard and extended character codes - are mapped to unicode.
         </p>
       </section>