diff --git a/core/src/mirror.h b/core/src/mirror.h
index b9fce0d..5778693 100644
--- a/core/src/mirror.h
+++ b/core/src/mirror.h
@@ -5,7 +5,7 @@
 #include "stdint.h"
 #include "string.h"
 #include "list.h"
-#include "strutil.h"
+#include "strutil.h" // included because the impl macros require strhash
 
 typedef uintptr_t typeid;
 
@@ -17,7 +17,11 @@ typedef struct {
 
 typedef struct {
     void* data;
-    IMirror const* tc;
+    union {
+        IMirror const* tc;
+        // this is cursed, but it allows the TC_CAST macro to work
+        IMirror const* mirror;
+    };
 } Mirror;
 
 typedef struct {
@@ -40,7 +44,7 @@ static inline int mirror_eq(const Mirror* lhs, const Mirror* rhs) {
 extern const void* mirror_get_typeclass(void* data, IMirror const* tc, const char* typeclass);
 // get the wrapper function for a given typeclass name
 // example:
-// 
+// mirror_get_function(physics_entity.data, physics_entity.mirror, "BehaviourEntity")
 extern void* mirror_get_function(void* data, IMirror const* tc, const char* typeclass_name);
 
 // macro reexport of mirror_get_function which will cast the function so it can be called immediately