diff --git a/backend/epjitsu.conf.in b/backend/epjitsu.conf.in
index a5d882d7f..65b0b9e50 100644
--- a/backend/epjitsu.conf.in
+++ b/backend/epjitsu.conf.in
@@ -17,6 +17,35 @@
 # find them. They should be ~65K, and have the scanner's name as part of the
 # file name. They are often inside a .cab file.
 
+# To extract .nal files from cabinet files on Linux, use the following steps:
+# (you need the "unshield" tool, which is - in Debian - in the unshield package)
+#
+#  1) Mount the ScanSnap installation DVD
+#     (mount point e.g. /media/dvd)
+#
+#  2) Extract the .nal files c$ from the cabinet files on the DVD
+#     using the following shell script:
+#
+#	# loop over all cabinet files found on the DVD
+#	for cab in $(find /media/dvd/ -name \*.cab); do
+#	    # search for .nal files in the cabinet files
+#	    nalinfo=$(unshield l $cab | grep '\.nal$')
+#
+#	    # we found something
+#	    if [ -n "$nalinfo" ]; then
+#	        #echo -e "=== $cab ===\n$nalinfo"
+#
+#	        # loop over all fields in $nalinfo
+#	        for nal in $nalinfo; do
+#	            # if the element of $nalinfo is a .nal file name
+#	            if echo "$nal" | grep -q '\.nal$' - 2>/dev/null; then
+#	                # extract .nal file form the cabinet file
+#	                unshield x "$cab" "${nal##*\\}"
+#	            fi
+#	        done
+#	    fi
+#	done
+
 # Copy the file someplace sane can reach it. Then update the line below.
 # NOTE: the firmware line must occur BEFORE the usb line for your scanner