diff --git a/doc/html/format.html b/doc/html/format.html
index 7af2dc41..5d700c06 100644
--- a/doc/html/format.html
+++ b/doc/html/format.html
@@ -822,7 +822,7 @@
 				<A HREF="#cuesheet_track_index"><I>CUESHEET_TRACK_INDEX</I></A>+
 			</TD>
 			<TD>
-				One or more track index points.
+				For all tracks except the lead-out track, one or more track index points.
 			</TD>
 		</TR>
 	</TABLE>
@@ -850,7 +850,7 @@
 				&lt;8&gt;
 			</TD>
 			<TD>
-				Index point number.  The first index in a track must have a number of 0 or 1, and subsequently, index numbers must increase by 1.  Index numbers must be unique within a track.
+				The index point number.  For CD-DA, an index number of 0 corresponds to the track pre-gap.  The first index in a track must have a number of 0 or 1, and subsequently, index numbers must increase by 1.  Index numbers must be unique within a track.
 			</TD>
 		</TR>
 		<TR>