For the budding yeast Saccharomyces cerevisiae the mitotic cell cycle is coordinated with cell mass at the regulatory step XstartX. The threshold amount of cell mass (reflected as a Xcritical sizeX) necessary for XstartX is proportional to nutrient quality. This relationship leads to a transient accumulation of cells at XstartX, termed nutrient modulation, upon enrichment of nutrient conditions. Nutrient enrichment abruptly increases the critical size needed for XstartX, causing the smaller cells, produced in the previous cell cycle, to be delayed at XstartX while growing larger. Here we show that, in S. cerevisiae, a second cell-cycle step, at mitosis, also exhibits nutrient modulation, and is, therefore, another point of cell-cycle regulation. At both mitosis and XstartX, nutrient modulation was found through mutation to be regulated by the activity of the cyclin-related WHI1 (CLN3) gene product.