Shloka 3.39Unverified draft
अनागतं च यत्किञ्चिद्रामस्य वसुधातले । तच्चकारोत्तरे काव्ये वाल्मीकिर्भगवानृषि: ।।1.3.39।।
Meaning
Whatever of Rama's story on this earth still remained to unfold, divine sage Valmiki likewise composed as the Uttara Kanda.
Reference: 1.3.39 · Bāla Kāṇḍa