The term "line of actual control" is said to have been used by Chinese Premier Zhou Enlai in a 1959 note to Indian Prime Minister Jawaharlal Nehru. The boundary existed only as an informal cease-fire line between India and China after the 1962 Sino-Indian War. In 1993, India and China agreed to respect of the 'Line of Actual Control' in a bilateral agreement, without demarcating the line itself.