diff --git a/code/__DEFINES/is_helpers.dm b/code/__DEFINES/is_helpers.dm
index c55b8216a3..b36396ba1e 100644
--- a/code/__DEFINES/is_helpers.dm
+++ b/code/__DEFINES/is_helpers.dm
@@ -9,6 +9,8 @@
 #define ismovableatom(A) (istype(A, /atom/movable))
 
 //Turfs
+//#define isturf(A) (istype(A, /turf)) This is actually a byond built-in. Added here for completeness sake.
+
 #define isopenturf(A) (istype(A, /turf/open))
 
 #define isindestructiblefloor(A) (istype(A, /turf/open/indestructible))