In ITU-T Y.3810 “Quantum key distribution network interworking – framework”, Figure 2 describes a reference model with reference point of Mx. But it is not defined in any Recommendations. Therefore, there needs to be specified the additional reference point, which is Mx for connecting two QKDN managers in ITU-T Y.3802. Mx is responsible for the QKDN manager to communicate management information with other QKDN manager. Since Y.3811 refers the functional architecture model in Y.3802, Figure 1 – Functional architecture of QoS assurance for QKDN needs to be revised for alignment with the amendment of Y.3802. This amendment revises Figure 1 – Functional architecture of QoS assurance for QKDN to include the Mx reference point and makes few editorial corrections.