diff --git a/html.nanorc b/html.nanorc
index 32d47d4..dd01965 100644
--- a/html.nanorc
+++ b/html.nanorc
@@ -6,3 +6,6 @@ color red "&[^;[[:space:]]]*;"
 color yellow ""[^"]*"|qq\|.*\|"
 color red "(action|alt|bgcolor|height|href|id|label|longdesc|method|name|onclick|onfocus|onload|onmouseover|rel|size|span|src|style|target|title|type|value|width)="
 color magenta start="<!--" end="-->"
+
+## Trailing spaces
+color ,green "[[:space:]]+$"