Context sensitive delimiter insertion when adding references is disclosed. In some embodiments, a plurality of indications of selections of a cell or cell range while in a formula editing mode in a host cell into which a formula is being entered is successively received, and in response to receiving each indication of selection of the plurality a reference to the selected cell or cell range is successively inserted into the formula, wherein the references inserted into the formula are delimited by a first delimiter type if in a first context and wherein the references inserted into the formula are delimited by a second delimiter type if in a second context.