diff --git a/code/__DEFINES/combat.dm b/code/__DEFINES/combat.dm
index 8aab6175..8acc1d8f 100644
--- a/code/__DEFINES/combat.dm
+++ b/code/__DEFINES/combat.dm
@@ -185,6 +185,12 @@ GLOBAL_LIST_INIT(shove_disarming_types, typecacheof(list(
 //We will round to this value in damage calculations.
 #define DAMAGE_PRECISION 0.1
 
+//bullet_act() return values
+#define BULLET_ACT_HIT				"HIT"		//It's a successful hit, whatever that means in the context of the thing it's hitting.
+#define BULLET_ACT_BLOCK			"BLOCK"		//It's a blocked hit, whatever that means in the context of the thing it's hitting.
+#define BULLET_ACT_FORCE_PIERCE		"PIERCE"	//It pierces through the object regardless of the bullet being piercing by default.
+#define BULLET_ACT_TURF				"TURF"		//It hit us but it should hit something on the same turf too. Usually used for turfs.
+
 //items total mass, used to calculate their attacks' stamina costs. If not defined, the cost will be (w_class * 1.25)
 #define TOTAL_MASS_TINY_ITEM		1.25
 #define TOTAL_MASS_SMALL_ITEM		2.5