The invention relates to N-alkyl-N-acylglucamines of formula (I), which exhibit in hair-washing agents comprising an aqueous surfactant system with at least one anionic surfactant, a hair-conditioning effect, wherein, in formula (I), Ra is a linear or branched, saturated or unsaturated C5-C21 alkyl radical and Rb represents a C1-C4 alkyl radical, and wherein the N-alkyl-N-acylglucamines (I) contain at least 8 wt. %, based on the total amount of N-alkyl-N-acylglucamines (I), of compounds with a saturated C16-, C18- or a mono- or polyunsaturated C18 fatty acid radical Ra—CO—.