diff --git a/c.nanorc b/c.nanorc
index 65e2d8d..6641fae 100644
--- a/c.nanorc
+++ b/c.nanorc
@@ -34,3 +34,6 @@ color cyan "<[^= 	]*>" ""(\\.|[^"])*""
 ## Comment highlighting
 color brightblue "//.*"
 color brightblue start="/\*" end="\*/"
+
+## Trailing whitespace
+color ,green "[[:space:]]+$"