diff --git a/etc/TODO b/etc/TODO
index 47040f1ea08..d210ecb7d6d 100644
--- a/etc/TODO
+++ b/etc/TODO
@@ -9,6 +9,8 @@ to the FSF.
 
 * Small but important fixes needed in existing features:
 
+** whitespace-cleanup should work only on the region if the region is active.
+
 ** Distribute a bar cursor of width > 1 evenly between the two glyphs
    on each side of the bar (what to do at the edges?).