  Inspired by the new soft theorem in gravity by Cachazo and Strominger, the
soft theorem for color-ordered Yang-Mills amplitudes has also been identified
by Casali. In this note, the same content of N=4 SYM using the Grassmannian
formulation is studied. Explicitly, in the holomorphic soft limit, we reduce
the n-particle amplitude in terms of Grassmannian contour integrations into the
deformed (n-1)-particle amplitude by localizing k variables relevant to the
n-th particle. Afterwards, the leading soft factor and sub-leading soft
operator naturally emerge.
