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jump-dev · Aug 24, 2019 · b282518 · b282518
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diff --git a/docs/src/solutions.md b/docs/src/solutions.md
@@ -95,8 +95,8 @@ The container type (e.g., scalar, vector, or matrix) of the returned solution
 
 The objective value of a solved problem can be obtained via
 [`objective_value`](@ref). The best known bound on the optimal objective
-value can be obtained via [`objective_bound`](@ref). If dual values are
-available, the value of the dual objective can be obtained via
+value can be obtained via [`objective_bound`](@ref). If the solver supports it,
+the value of the dual objective can be obtained via
 [`dual_objective_value`](@ref).
 
 The following is a recommended workflow for solving a model and querying the

diff --git a/src/objective.jl b/src/objective.jl
@@ -28,7 +28,8 @@ objective_value(model::Model)::Float64 = MOI.get(model, MOI.ObjectiveValue())
     dual_objective_value(model::Model)
 
 Return the value of the objective of the dual problem after a call to
-`optimize!(model)`.
+`optimize!(model)`. Throws `MOI.UnsupportedAttribute{MOI.DualObjectiveValue}` if
+the solver does not support this attribute.
 """
 dual_objective_value(model::Model)::Float64 = MOI.get(model, MOI.DualObjectiveValue())