In a large parasol with a textile fabric roof with adjustable canopy strut ends for the attachment of the canopy fabric, in order to avoid the attaching seams of the canopy fabric from being openly exposed to the UV radiation and to prevent the connection to the fabric roof from becoming displaced or twisted inadvertently either in the open state or in the closed and relaxed state of the parasol, welt bulges are attached to the parasol roof edge along the seams of the parasol roof parts, the extensions comprising welt grooves, the welt bulges engaging in the welt grooves of the extensions and the welt bulges being held at the outer end of the extensions by means of a screw.