diff --git a/lib/AstrodynamicalSolvers/docs/src/index.md b/lib/AstrodynamicalSolvers/docs/src/index.md
index b1c7d857..121124b3 100644
--- a/lib/AstrodynamicalSolvers/docs/src/index.md
+++ b/lib/AstrodynamicalSolvers/docs/src/index.md
@@ -64,7 +64,7 @@ unstable = let
     ic = halo(μ, 1; amplitude=0.005)
 
     u = CartesianState(ic)
-    Φ = monodromy(u, μ, ic.Δt)
+    Φ = monodromy(u, μ, ic.Δt, CR3BFunction(stm=true))
 
     ics = let
         problem = ODEProblem(CR3BFunction(stm=true), vcat(u, vec(I(6))), (0, ic.Δt), (μ,))
diff --git a/lib/AstrodynamicalSolvers/src/Propagation.jl b/lib/AstrodynamicalSolvers/src/Propagation.jl
index 9c76192a..d13785f1 100644
--- a/lib/AstrodynamicalSolvers/src/Propagation.jl
+++ b/lib/AstrodynamicalSolvers/src/Propagation.jl
@@ -140,7 +140,7 @@ function monodromy(
     u::AbstractVector,
     μ,
     T,
-    f;
+    f::Function;
     algorithm = Vern9(),
     reltol = 1e-12,
     abstol = 1e-12,