diff --git a/src/model/linmodel.jl b/src/model/linmodel.jl
index cfc515010..e4d1c28b9 100644
--- a/src/model/linmodel.jl
+++ b/src/model/linmodel.jl
@@ -68,7 +68,7 @@ end
 @doc raw"""
     LinModel(sys::StateSpace[, Ts]; i_u=1:size(sys,2), i_d=Int[])
 
-Construct a linear model from state-space model `sys` with sampling time `Ts` in second.
+Construct a linear model from state-space model `sys` with sampling time `Ts` in seconds.
 
 The system `sys` can be continuous or discrete-time (`Ts` can be omitted for the latter).
 For continuous dynamics, its state-space equations are (discrete case in Extended Help):
diff --git a/src/model/nonlinmodel.jl b/src/model/nonlinmodel.jl
index 4877a0f6a..d1c68d0f4 100644
--- a/src/model/nonlinmodel.jl
+++ b/src/model/nonlinmodel.jl
@@ -133,9 +133,9 @@ form. The optional parameter `NT` explicitly set the number type of vectors (def
 See also [`LinModel`](@ref).
 
 # Arguments
-- `f::Function` or `f!`: state function.
-- `h::Function` or `h!`: output function.
-- `Ts`: sampling time of in second.
+- `f::Function` or `f!`: state function of the model.
+- `h::Function` or `h!`: output function of the model.
+- `Ts`: sampling time of the model in seconds.
 - `nu`: number of manipulated inputs.
 - `nx`: number of states.
 - `ny`: number of outputs.