The invention concerns an elastomeric composition based on at least a diene elastomer, an inorganic filler as reinforcing filler, a polyorganosilane as coupling agent (inorganic filler/diene elastomer), bearing at least two functions designated X and Y , capable of being grafted on the elastomer by function X and on the inorganic filler by function Y. The invention is characterised in that said function Y is a hydroxysilyl function ( Si-OH). Preferably, said organosilane is a hydroxysilane polysulphide, the diene elastomer is selected in the group consisting of polybutadienes, natural rubber, synthetic polyisoprenes, butadiene copolymers, isoprene copolymers, and the reinforcing inorganic filler is a highly dispersible silicious or aluminous filler. The invention also concerns tyres or semi-finished products for tyres, in particular running treads for tyres comprising the inventive composition.