diff --git a/lib/stable.pm b/lib/stable.pm
index ba0ce6e..98af4f1 100644
--- a/lib/stable.pm
+++ b/lib/stable.pm
@@ -12,6 +12,7 @@ my %allow_at = (
 	isa           => 5.032000,
 	lexical_subs  => 5.022000,
 	postderef     => 5.020000,
+	signatures    => 5.028000,
 );
 
 sub import {
@@ -125,6 +126,8 @@ change, but significant bugs makes them unsafe to use before 5.22.
 
 =item * C<postderef> - stable as of perl 5.20, available via stable 0.031
 
+=item * C<signatures> - stable as of perl 5.28, available via stable 0.032
+
 =back
 
 =head1 SEE ALSO