In this short paper, continuous-time optimal control problems are treated, where the cost functional includes additional discrete state penalty terms

at specified times

in the interior of the time interval
![[t_{0}, t_{N}]](/images/tex/4284.gif)
of the problem. Necessary conditions for a control to be optimal are given in the form of a minimum principle. The costate is necessarily discontinuous at the times

. Consequently, the optimal control is discontinuous at t
j, in general. A numerical example is given.