The invention relates to a method for attaching guide means (106) to a flexible sheet (100), preferably as part of a shading system for a vehicle, and to a device provided therefor. Holding regions (102a, 102b), spaced apart from one another in a Y-direction, of a flexible sheet (100) extending in an X-direction and a Y-direction are spaced apart from one another by being acted upon with a predetermined pretensioning force (Fv) acting in the Y-direction, with the result that a pretension state is achieved. Subsequently, in a further processing state which corresponds to the pretension state or to a pretension state relieved by the amount of a predetermined relief distance (S3) in the Y-direction with respect to the pretension state, guide means (106) extending parallel to one another in the X-direction and spaced apart from one another in the Y-direction are fastened to the sheet (100).