diff --git a/v2_0_cpp_visitor.md b/v2_0_cpp_visitor.md
index 082d6b1..c0e2830 100644
--- a/v2_0_cpp_visitor.md
+++ b/v2_0_cpp_visitor.md
@@ -171,10 +171,10 @@ struct json_like_visitor : msgpack::v2::null_visitor {
         return true;
     }
     void parse_error(size_t /*parsed_offset*/, size_t /*error_offset*/) {
-        EXPECT_TRUE(false);
+        // report error.
     }
     void insufficient_bytes(size_t /*parsed_offset*/, size_t /*error_offset*/) {
-        EXPECT_TRUE(false);
+        // report error.
     }
     std::string& m_s;
 };