diff --git a/ruby.nanorc b/ruby.nanorc
index f192746..ca4f3a6 100644
--- a/ruby.nanorc
+++ b/ruby.nanorc
@@ -30,3 +30,5 @@ color brightcyan "##[^{].*$" "##$"
 color green start="<<-?'?EOT'?" end="^EOT"
 ## Some common markers
 color brightcyan "(XXX|TODO|FIXME|\?\?\?)"
+## Trailing spaces
+color ,green "[[:space:]]+$"