Upon release, the song became a minor R&B hit, making #36 on the Billboard Soul Charts.
Motown's The Temptations had originally recorded the song about one month before The Monitors (in June 1965), and their version was released on the group's fourth album, 1966's Gettin' Ready.
Richard Street (who would later join the Tempts' years later) led the Monitors' version.
In the song itself, the narrator pleads to his lover asking her to confirm their love.
The song's title is in answer to a question the narrator asks of her in the first verse: Some 46 years after the single release of "Say You", a Monitors compilation album entitled Say You!