The Independent JPEG Group's JPEG software v6a
diff --git a/wizard.doc b/wizard.doc
index ad1d229..54170b2 100644
--- a/wizard.doc
+++ b/wizard.doc
@@ -137,14 +137,18 @@
indexes are not the "component ID" codes assigned to the components, just
positional indexes.)
-If the progression parameters Ss,Se,Ah,Al are omitted, the values 0,63,0,0
-are used, producing a sequential JPEG file. cjpeg automatically determines
-whether the script represents a progressive or sequential file, by observing
-whether Ss and Se values other than 0 and 63 appear. (The -progressive
-switch is unnecessary and is ignored when -scans appears.) When specifying
-progression parameters, the user must follow the JPEG restrictions on
-progression parameters. (cjpeg checks that the spec's requirements are
-obeyed.)
+The progression parameters for each scan are:
+ Ss Zigzag index of first coefficient included in scan
+ Se Zigzag index of last coefficient included in scan
+ Ah Zero for first scan of a coefficient, else Al of prior scan
+ Al Successive approximation low bit position for scan
+If the progression parameters are omitted, the values 0,63,0,0 are used,
+producing a sequential JPEG file. cjpeg automatically determines whether
+the script represents a progressive or sequential file, by observing whether
+Ss and Se values other than 0 and 63 appear. (The -progressive switch is
+not needed to specify this; in fact, it is ignored when -scans appears.)
+The scan script must meet the JPEG restrictions on progression sequences.
+(cjpeg checks that the spec's requirements are obeyed.)
Scan script files are free format, in that arbitrary whitespace can appear
between numbers and around punctuation. Also, comments can be included: a