diff --git a/src/clj/coffi/ffi.clj b/src/clj/coffi/ffi.clj
index a0d7f51..bc4c7b1 100644
--- a/src/clj/coffi/ffi.clj
+++ b/src/clj/coffi/ffi.clj
@@ -887,6 +887,8 @@
                          (to-object-asm arg)])
                       arg-types)
                      [:invokevirtual IFn "invoke" (repeat (inc (count arg-types)) Object)]
+                     ;; TODO(Joshua): If this returns nil and this is primitive,
+                     ;; return a default value
                      (to-prim-asm ret-type)
                      [(return-for-type ret-type :areturn)]]}]})