diff --git a/gc.h b/gc.h
index 3cdb7e3..9a05678 100644
--- a/gc.h
+++ b/gc.h
@@ -1,8 +1,11 @@
 #ifndef GC_H
 #define GC_H
 
-// Marks references that are still in use
-void mark(struct virtualMachine *vm);
+// Marks a single reference if it is still in use
+void mark(struct garbageObject *obj);
+
+// Marks all references that are still in use
+void markAll(struct virtualMachine *vm);
 
 // Deletes references that are no longer in use
 void sweep(struct virtualMachine *vm);