August 2021 values of collection modes for the CPI Commodities and Services Survey were updated to correct miscalculations of telephone and web. The reported values of 16% for telephone collection and 84% for online collection were incorrect. The correct values were 15% for telephone collection and 85% for online collection. The values have been corrected in the August, September, and October files on the Effects of COVID-19 Pandemic and Response on the Consumer Price Index webpage. This information has been added to the errata page.