diff --git a/reapi/extra/amxmodx/scripting/include/cssdk_const.inc b/reapi/extra/amxmodx/scripting/include/cssdk_const.inc
index 65ced5b..8aa09a0 100644
--- a/reapi/extra/amxmodx/scripting/include/cssdk_const.inc
+++ b/reapi/extra/amxmodx/scripting/include/cssdk_const.inc
@@ -71,6 +71,14 @@
 #define FL_KILLME                       (1<<30) // This entity is marked for death -- This allows the engine to kill ents at the appropriate time
 #define FL_DORMANT                      (1<<31) // Entity is dormant, no updates to client
 
+/**
+* global_get(glb_trace_flags) values
+* @note Custom flags that we can retrieve in pfnShouldCollide/TraceLine/TraceHull
+*/
+#define FTRACE_BULLET			(1<<16)
+#define FTRACE_FLASH			(1<<17)
+#define FTRACE_KNIFE			(1<<18)
+
 /**
 * get_entvar(entity, var_movetype) values
 */