diff --git a/TODO b/TODO
index e27482bbe..78ce195e4 100644
--- a/TODO
+++ b/TODO
@@ -39,3 +39,4 @@ TODO:
 * allow passing arguments to meta setter/getter (we can fallback on meta invoke for everything probably)
 * delegate/sigh: forward connect/disconnect from & to *
 * a few more tests on the improved shrink_to_fit for sparse arrays
+* -Wextra