diff --git a/README.md b/README.md
index 467dbba..1ee9ed6 100644
--- a/README.md
+++ b/README.md
@@ -53,6 +53,7 @@ The Ipopt optimizer supports the following constraints and attributes.
 List of supported objective functions:
 
  * [`MOI.ObjectiveFunction{MOI.ScalarAffineFunction{Float64}}`](@ref)
+ * [`MOI.ObjectiveFunction{MOI.ScalarNonlinearFunction}`](@ref)
  * [`MOI.ObjectiveFunction{MOI.ScalarQuadraticFunction{Float64}}`](@ref)
  * [`MOI.ObjectiveFunction{MOI.VariableIndex}`](@ref)