diff --git a/src/Simulations/simulation.jl b/src/Simulations/simulation.jl
index 1fe2962c69..7f267ecfb3 100644
--- a/src/Simulations/simulation.jl
+++ b/src/Simulations/simulation.jl
@@ -46,8 +46,9 @@ Construct a `Simulation` for a `model` with time step `Δt`.
 Keyword arguments
 =================
 
-- `Δt`: Required keyword argument specifying the simulation time step. Can be a `Number`
-        for constant time steps or a `TimeStepWizard` for adaptive time-stepping.
+- `Δt`: Required keyword argument specifying the simulation time step. Can be either a `Number`
+        for constant time steps, a `TimeStepWizard` for adaptive time-stepping, or a `Dates.Period`
+        if the `model` has a DateTime clock.
 
 - `stop_iteration`: Stop the simulation after this many iterations. Default: `Inf`.