diff --git a/README.md b/README.md
index abefc76..4c575e6 100644
--- a/README.md
+++ b/README.md
@@ -49,7 +49,7 @@ constraint_equations = [
       sum(optimization_variables.measurements.w₁) ≲ 3,
 ]
 
-@named constraint_set = ConstraintsSystem(constraint_equations, optimization_variables,[])
+@named constraint_set = ConstraintsSystem(constraint_equations, optimization_variables, Num[])
 
 # Initialize the optimization problem
 optimization_problem = OptimizationProblem(oed_problem, AutoForwardDiff(),