Abstract: In a method of folding a curtain-type side airbag (10) into an elongate airbag package (12) defining a longitudinal direction (L), wherein the side airbag (10) at one longitudinal end includes an elongate inflatable extension (14) having a free end (34), in a first folding step the extension (14) is folded over at a first folding line (30) enclosing an angle (?) <90°, especially between 30° and 60°, with the longitudinal direction (L), and in a second subsequent folding step the free end (34) of the extension (14) is folded over at a second folding line (36), the second folding line (36) enclosing an angle (?) of 0 to 45°, especially 0°, with the longitudinal direction (L).