diff --git a/src/estimator/construct.jl b/src/estimator/construct.jl
index 0bc8878a6..8efbe17f6 100644
--- a/src/estimator/construct.jl
+++ b/src/estimator/construct.jl
@@ -370,7 +370,7 @@ function default_nint(model::LinModel, i_ym=1:model.ny, nint_u=0)
 end
 
 """
-    default_nint(model::SimModel, i_ym=1:model.ny, nint_u=0)
+    default_nint(model::SimModel, i_ym=1:model.ny, nint_u=0) -> nint_ym
 
 One integrator on each measured output by default for other cases e.g. [`NonLinModel`](@ref).