diff --git a/niarena.h b/niarena.h
index ab69957..1351277 100644
--- a/niarena.h
+++ b/niarena.h
@@ -25,7 +25,8 @@
 #define NIARENA_FREE(p) free(p)
 #endif
 
-// Definitions
+// TODO: clone with pointer + size
+
 typedef struct _NIArena {
 	void *buffer;
 	size_t capacity;