diff --git a/doc/syntax/debian.nanorc b/doc/syntax/debian.nanorc
index 14059b88c279d602177431e92295a3c8a6accfb8..a945deeac94c0d0d253ec4351981ef00bfea3877 100644
--- a/doc/syntax/debian.nanorc
+++ b/doc/syntax/debian.nanorc
@@ -4,14 +4,14 @@
 ##
 syntax "apt/sources.list" "sources\.list(\.old|~)?$"
 # component
-color brightmagenta "^deb(-src)? ((http|file|ftp):/[^ ]+|cdrom:\[[^\]]+\]/|cdrom:\[[a-zA-Z0-9\._-\(\) ]+\]/) [^ ]+ .+$"
+color brightmagenta "^deb(-src)? ((http|file|ftp):/[^ ]+|cdrom:\[[^\]]+\]/|cdrom:\[[-a-zA-Z0-9\._\(\) ]+\]/) [^ ]+ .+$"
 # distribution
-color brightred "^deb(-src)? ((http|file|ftp):/[^ ]+|cdrom:\[[^\]]+\]/|cdrom:\[[a-zA-Z0-9\._-\(\) ]+\]/) [^ ]+"
+color brightred "^deb(-src)? ((http|file|ftp):/[^ ]+|cdrom:\[[^\]]+\]/|cdrom:\[[-a-zA-Z0-9\._\(\) ]+\]/) [^ ]+"
 # URI
 color brightgreen "(http|file|ftp):/[^ ]+"
 # cdroms
 # [^\]] does not work...
-color brightgreen "cdrom:\[[a-zA-Z0-9\._-\(\) ]+\]/"
+color brightgreen "cdrom:\[[-a-zA-Z0-9\._\(\) ]+\]/"
 # deb / deb-src
 color yellow "^deb"
 color yellow "^deb-src"