diff --git a/wadsrc/static/language.enu b/wadsrc/static/language.enu
index 12228e980..ad011e9b3 100644
--- a/wadsrc/static/language.enu
+++ b/wadsrc/static/language.enu
@@ -2130,6 +2130,7 @@ GMPLYMNU_NORESPAWN			= "No respawn";
 GMPLYMNU_ITEMSRESPAWN		= "Items respawn";
 GMPLYMNU_SUPERRESPAWN		= "Big powerups respawn";
 GMPLYMNU_FASTMONSTERS		= "Fast monsters";
+GMPLYMNU_INSTANTREACTION	= "Instant monster reaction";
 GMPLYMNU_DEGENERATION		= "Degeneration";
 GMPLYMNU_NOAUTOAIM			= "Allow Autoaim";
 GMPLYMNU_ALLOWSUICIDE		= "Allow Suicide";