Valmiki Ramayana 6.121.24

इत्यार्षे श्रीमद्रामायणे वाल्मीकीये आदिकाव्ये श्रीमद्युद्धकाण्डे एकविंशत्युत्तरशततमः सर्गः॥

ityārṣe śrīmadrāmāyaṇe vālmīkīye ādikāvye śrīmadyuddhakāṇḍe ekaviṃśatyuttaraśatatamaḥ sargaḥ ||

Our plain-language meaning of this verse is waiting for scholar review.