A rotary cutting tool (10) has an axis of rotation (R) and a tool body (12) extending along the axis of rotation (R) and having at least one coolant channel (30). At least a portion (32) of the at least one coolant channel (30) is formed by a groove (40) in a circumferential face (42) of the tool body (12). Furthermore, the at least one coolant channel (30) in the portion (32) of the groove (40) is closed in the radial direction by an add-on part of the rotary cutting tool (10) attached to the tool body (12). Furthermore, a method for manufacturing such a rotary cutting tool (10) is provided.