Update ExtendedStateSpace.jl

Author: baggepinnen

src/ExtendedStateSpace.jl

@@ -649,8 +649,8 @@ _I2mat(i::UniformScaling,nx) = i(nx)
 Partition `P` into an [`ExtendedStateSpace`](@ref).
 - `u` indicates the indices of the controllable inputs.
 - `y` indicates the indices of the measurable outputs.
-- `w` is the complement of `u`.
-- `z` is the complement of `y`.
+- `w` indicates the indices of the disturbance inputs (uncontrollable), by default `w` is the complement of `u`.
+- `z` indicates the indices of the performance outputs (not neccesarily measurable), by default `z` is the complement of `y`.
 """
 function partition(P::AbstractStateSpace; u=nothing, y=nothing,
     w = nothing,
@@ -710,4 +710,4 @@ See also [`performance_mapping`](@ref), [`system_mapping`](@ref), [`noise_mappin
 """
 function noise_mapping(P::ExtendedStateSpace, sminreal=sminreal)
     sminreal(ss(P.A, P.B1, P.C2, P.D21, P.timeevol))
-end
+end