  The open string dual to a 1/6 BPS Wilson line in the ${\cal N} = 6$ super
Chern-Simons-matter theory is coupled to a flat Kalb-Ramond field. We show that
the resulting boundary term imposes mixed boundary conditions on the fields
that describe the fluctuations on the world-sheet. These boundary conditions
fix a combination of the derivatives of the fluctuations, parallel and
transverse to the boundary. We holographically compute the correlation
functions of insertions on the Wilson line in terms of world-sheet Witten
diagrams. We observe that their functional dependence is consistent with the
conformal symmetry on the line.
