When Rama had unfolded his intentions to him, he (Sugriva) showed to him the piece of cloth dropped among the monkeys by Şita while being carried off (by Ravana).
तद् वासो दर्शयामासुस्तस्य कार्ये निवेदिते। वानराणां तु यत् सीता ह्रियमाणा व्यपासृजत्॥