If your splines conform to the standard, you should be able to minimize the information required to clearly specify them; however, it doesn't hurt to have the inspection dimensions also listed on the part drawing too.
Flat Root Side Fit
26T x 24/48 DP @ 30°
ANSI B92.1-1970 Class 5
In theory, this specification provides enough information for the manufacturing of the standard ANSI spline -- it doesn't, however, make it easy. Having the pin size and over-pin/between pin dimensions and tolerances, span length, etc. means the machinist doesn't have to look up the information in the ANSI standard nor calculate the dimensions and allowable tolerances themselves.