Ayodhya Kanda 10.40

Thus spoken to, she (Kaikeyi) breathed a sigh of relief. Intending to tell him the unpleasant thing (which was in her mind), she began tormenting her husband all the more. इत्यार्षे श्रीमद्रामायणे वाल्मीकीय आदिकाव्ये अयोध्याकाण्डे दशमस्सर्गः।। Thus ends the tenth sarga of Ayodhyakanda of the holy Ramayana, the first epic composed by sage Valmiki.