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The benzofuran residue in the title compound, C11H10O4, is essentially planar (the r.m.s. deviation for the nine non-H atoms = 0.011 Å). While the methoxy group is coplanar with the fused ring system [C—C—O—C torsion angle = 3.1 (3)°], the acetic acid residue occupies a position almost prime [C—C—C—C = 77.0 (2)°]. In the crystal, centrosymmetrically related molecules are linked by O—H...O hydrogen bonds to form eight-membered {...HOCO}2 synthons. The dimeric aggregates assemble into supramolecular layers in the ab plane via benzene-C—H...O(ring) interactions.