NOVELTY - Cellulosic material is degraded or converted by treating the cellulosic material with an amount of cellulolytic proteins in the presence of a polypeptide having cellulolytic enhancing activity.    USE - For degrading or converting of cellulosic material for production of detergent composition (claimed).    ADVANTAGE - The method improves the conversion of cellulosic feedstocks by making use of polypeptides having cellulolytic enhancing activity.    DETAILED DESCRIPTION - Degrading or converting of cellulosic material comprises treating the cellulosic material with an amount of cellulolytic proteins in the presence of a polypeptide having cellulolytic enhancing activity. The presence of the polypeptide increases the degradation of cellulosic material compared to its absence. The polypeptide having cellulolytic enhancing activity consists of (a) a polypeptide comprising an amino acid sequence which has greater than or equal to70% identity with the mature polypeptide having a defined sequence 249 amino acids (SEQ ID NO: 2), given in the specification; (b) a polypeptide encoded by a polynucleotide which hybridizes under medium stringency conditions with (i) the mature polypeptide having defined sequence of 1172 base pairs (bp) (SEQ ID NO: 1), given in the specification, (ii) the genomic DNA sequence comprising the mature polypeptide coding sequence of SEQ ID NO: 1, or (iii) a complementary strand of (i) or (ii); (c) a polypeptide comprising (ILMV)-P-x(4,5)-G-x-Y(ILMV)-x-R-x-(EQ)-x(3)-A-(HNQ); and (d) a variant comprising a conservative substitution, deletion, and/or insertion of amino acids of the mature polypeptide of SEQ ID NO: 2.    x=amino acid;    x(4,5)=amino acid at 4 or 5 contiguous positions;and    x(3)=amino acid at 3 contiguous positions.    INDEPENDENT CLAIMS are included for:    (1) a method for producing a substance, comprising (A) saccharifying a cellulosic material with an amount of cellulolytic proteins in the presence of the polypeptide having cellulolytic enhancing activity; (B) fermenting the saccharified cellulosic material with fermentating microorganisms; and (C) recovering the substance from the fermentation; and    (2) a detergent composition comprising the polypeptide having cellulolytic enhancing activity.    DESCRIPTION OF DRAWING(S) - The figure is a view of a restriction map of pTr3337.