You might also use the cite attribute on the <ins> and <del> element to indicate the source or reason for a change, although this attribute is quite limiting, as the value must be a URI. The <ins> and <del> elements can also carry a datetime attribute whose value is a date and time in the following format: YYYY-MM-DDThh:mm:ssTZD This formula breaks down as follows: ??? YYYY represents the year. ??