This well-written paper examines stability and robustness (with respect to unmodeled dynamics) of continuous-time adaptive controllers for linear time-varying continuous-time systems with bounded, slowly varying parameters, or parameters with infrequent jumps. The main stability result is that under all hypotheses stated in the paper (A,B,C,D, etc.) BIBO stability of the system can be achieved under certainty equivalence adaptive control. These results are important as they lend credibility to the use of adaptive control algorithms. The references given are extensive, but some are not easily attained. What is not addressed in this paper are the effects of discretization on the algorithms which is necessary for solution, since the derivatives of the observations are not available. Also, no definitive assessment of the quality of identification or the quality of the adaptation can be determined from the analysis given in this paper. Some points: 1.) The introduction in (2.7)-(2.10) of unmodeled dynamics is somewhat artificially contrived (by adding zero's in (2.7)). 2) The description of unmodeled dynamics in Remark 2.2 ignores the possibility of unmodeled nonlinear dynamics, which is particularly relevant in the case when the model represents a linearization of a nonlinear model. 3) Error bounds such as (3.3) (3.4) or (3.15) (3.16) indicate that the error can grow like the size of the observations. This, in itself, is not very significant.