diff --git a/doc/sane-mustek_pp.man b/doc/sane-mustek_pp.man
index 55427f17c..15e830d07 100644
--- a/doc/sane-mustek_pp.man
+++ b/doc/sane-mustek_pp.man
@@ -1,4 +1,4 @@
-.TH sane-mustek_pp 5 "30 September 2000"
+.TH sane-mustek_pp 5 "21 April 2001"
 .IX sane-mustek_pp
 .SH NAME
 sane-mustek_pp - SANE backend for Mustek parallel port flatbed scanners
@@ -24,9 +24,9 @@ SM 1200 ED Plus      1015      01          partly
 .br
 SE 12000 P           1505      05          no
 .br
-SE 600 CP            1015      00          no
+SE 600 CP            1015      00          no (*)
 .br
-SM 600 CP            1015      00          no
+SM 600 CP            1015      00          no (*)
 .br
 600 III EP Plus      1013/1015 00/01       yes
 .br
@@ -40,11 +40,16 @@ Gallery 4800         ????      ??          yes
 .br
 Viviscan Compact II  1013      00          yes
 .br
-MD985x               1015      01/05       no
+MD985x               1015      01/05       no (*)
 .br
-LT9891               1015      01          no
+LT9891               1015      01          no (*)
 .RE
 .PP
+(*) These scanners are currently not supported by the default driver, 
+but patches are available; see 
+.B CIS 
+.BR Scanners .
+.PP
 Please note that this backend is still under construction. I don't know
 which scanners work or which will work in future releases.
 .PP
@@ -351,10 +356,50 @@ port 0x378
 
 .SH CIS Scanners
 
-Some Mustek Scanners use so called contact image sensors instead of CCDs (cold cathode devices). This scanners have a totally different protcol: although the seem to work they are far from being supported. 
+Some Mustek Scanners use so called contact image sensors (CIS) instead of 
+cold cathode devices (CCD). These scanners have a totally different
+protocol; they are currently not supported by the default driver. 
 .PP
-Check out the homepage of Eddy De Greef for some patches for CIS...
-
+However, patches are available that support most of the CIS type scanners.
+Check out the homepage of Eddy De Greef for these patches (see the
+.B SEE ALSO
+section). 
+.PP
+These patches have been reported to work on the Mustek 600CP, 1200CP, 
+and 1200CP+ models, and various OEM versions (LifeTec/Medion 9350, 9351,
+9850, 9851, 9858, 9890, and 9891; Trust Easy Connect 9600 plus; 
+Targa Funline TS12EP).
+.PP
+When installing these patches, 3 additional options are available in the 
+.B mustek_pp.conf 
+configuration file (see 
+.BR CONFIGURATION ): 
+.BR cis600 ,
+.BR cis1200 ,
+.BR cis1200+ .
+.PP
+These options select the 600CP, 1200CP, or 1200CP+ version of the driver. 
+One of them must be set.
+.PP
+The 600CP has a maximum resolution of 300x600 DPI, whereas the 1200CP
+and 1200CP+ have a maximum resolution of 600x1200 DPI. The option must
+match your scanner. If unsure, check the manual or the box.
+.br
+.B Choosing the wrong option could damage your scanner!
+.B Especially, using the 1200CP settings on a 600CP can be harmful.
+.B If the scanner starts making a loud noice, turn it off immediately !!!
+.PP
+The 
+.B cis...
+options cannot be combined with the 
+.BR use600
+option.
+.PP
+Currently, when installing the CIS patches, support for CCD type scanners is
+disabled. In future versions of the
+.B sane-mustek_pp 
+backend, the CIS patches will be integrated and support for both types
+of scanners will co-exist.
 .SH FILES
 .TP
 .I @CONFIGDIR@/mustek_pp.conf