--- a/608toVTT/608toVTT.html	Sat Nov 03 10:59:33 2012 +1100
+++ b/608toVTT/608toVTT.html	Sat Nov 03 19:58:40 2012 +1100
@@ -499,7 +499,19 @@
         </p>
 
         <p>
-          The "Lock Rows" and “Lock Columns” Caption Window parameters if set fix the maximum number of rows and columns of caption text that a window may have. This means that lines that were rendered at the font size set by the WebVTT format are not changed when the user changes the font size. If rows or columns are unlocked, rendering can change the line breaks and fill the defined region with different lines.
+          The "Lock Rows" and “Lock Columns” Caption Window parameters of CEA-708 when set fix the maximum number of rows and columns of caption text that a window may have. This means that lines that were rendered at the default font size are not changed when the user changes the font size. Thus, when the user changes the font size, the window's size scales to become smaller or larger to accommodate the smaller or bigger space required to render the caption text.
+        </p>
+
+        <p>
+          If rows or columns are unlocked, rendering can change the line breaks. This means that if e.g. rows are unlocked, the defined caption window width remains fixed, such that for smaller fonts more words will fit in each line, and for larger fonts less words will fit in. Similarly for unlocked columns. If both are unlocked, the agreement is that the same happens as when both dimensions are locked.
+        </p>
+
+        <p>
+          In WebVTT we don't currently have a means to specify row and column locking. We currently only support the concept of unlocked rows and columns, i.e. when the user increases or decreases the font size, the Region will grow accordingly, but it is possible for lines to reflow.
+        </p>
+
+        <p>
+          
         </p>
       </section>