Add comments about INDEX pregap vs. PREGAP.

formats.txt

@@ -110,6 +110,9 @@ INDEX
 	``index``
 		time in MSF format.
 
+Having an ``INDEX 00`` and an ``INDEX 01`` defines a pregap using data from the
+``FILE``.
+
 ISRC
 ~~~~
 
@@ -143,6 +146,8 @@ PREGAP
 	``pregap``
 		time in MSF format.
 
+The pregap is filled with generated silence.
+
 REM
 ~~~
 

tools/cuebreakpoints.c

@@ -45,7 +45,8 @@ void print_breaks (Cd *cd)
 	long b;
 	Track *track;
 
-	for (i = 1; i <= cd_get_ntrack(cd); i++) {
+	/* start on track 2 */
+	for (i = 2; i <= cd_get_ntrack(cd); i++) {
 		track = cd_get_track(cd, i);
 		/* don't print zero indexes */
 		b = track_get_start(track) + track_get_index(track, 1) -  track_get_zero_pre(track);