While sound glosses from the Six Dynasties and early Tang provide direct evidence for morphological alternations in Archaic Chinese, studies on the syntax of this language generally disregard these data. This neglect is due in part to perceived unreliability of these sound glosses. In this paper, I first argue that the arguments against their reliability do not stand scrutiny, and that they are not a simple philological curiosity, but have the potential to enrich studies on Archaic Chinese syntax, and plead for more collaboration between syntacticians and historical phonologists.