  We employed published rotation periods of {\it Kepler} field stars to test
whether stars hosting planets tend to rotate more slowly than stars without
known planets. Spectroscopic vsini observations of nearby stars with planets
have indicated that they tend to have smaller visni values. We employ data for
{\it Kepler} Objects of Interest (KOIs) from the first 16 quarters of its
original mission; stellar parameters are based on the analysis of the first 17
quarters. We confirm that KOI stars rotate more slowly with much greater
confidence than we had previously found for nearby stars with planets.
Furthermore, we find that stars with planets of all types rotate more slowly,
not just stars with giant planets.
