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We detect 21-cm emission from the Low Surface Brightness (LSB) galaxy SBS1543+593, which gives rise to a Damped Lyman-alpha (DLA) absorption line in thespectrum of the background QSO HS 1543+5921 (z=0.807). We obtain an accuratemeasure of the velocity of the H I gas in the LSB galaxy, v=2868 km/s, andderive a mass of 1.3e9 solar masses. We compare this value with limits obtainedtowards two other z~0.1 DLA systems, and show that SBS 1543+593 would not havebeen detected. Hence LSB galaxies similar to SBS 1543+593 can be responsiblefor DLA systems at even modest redshifts without being detectable from their21-cm emission.Comment: 4 pages, 1 figure, accepted for publication in A&

21-cm H I emission from the Damped Lyman-$\vec{\alpha}$ absorber SBS 1543+593