diff --git a/code/game/machinery/doors/shutters.dm b/code/game/machinery/doors/shutters.dm
index 87e8c8f6a7..362dde1157 100644
--- a/code/game/machinery/doors/shutters.dm
+++ b/code/game/machinery/doors/shutters.dm
@@ -53,7 +53,9 @@
 		if("opening")
 			rad_insulation = 1
 		if("closing")
-			rad_insulation = 0.2
+			rad_insulation = -0.5
+
+// A 3x3 N2 SM setup won't irradiate you if you're behind the shutter at -0.9 insulation. If it starts to delam, it'll start irradiating you slowly. Keep the value between -0.1 to -0.9
 
 /obj/machinery/door/poddoor/shutters/window
 	name = "windowed shutters"