The race extension allows for multiple race categories and detailed races as illustrated in the examples. Add the following clarifications for the reader: 1) repeat the US Core Race and Ethnicity Extension's guidance on US Core Patient Profile page's Profile Specific Implementation Guidance: This Complex Extension for race allows one or more race codes of which: Must Support  at least one code from OMB Race Categories May include additional race codes from CDC Race Codes Must include text description of race This Complex Extension for ethnicity allows one or more ethnicity codes of which: Must Support  one code from OMB Ethnicity Categories May include additional ethnicity codes from CDC Ethnicity Codes Must include text description of ethnicity 2) and within the short description, add: Note that multiple races are permitted; see the extension's page Note that multiple ethinicities are permitted; see the extension's page