diff --git a/optimizerapi/openapi/specification.yml b/optimizerapi/openapi/specification.yml
index c25396a..5646029 100644
--- a/optimizerapi/openapi/specification.yml
+++ b/optimizerapi/openapi/specification.yml
@@ -121,6 +121,12 @@ components:
         extras:
           description: A plain JSON object that can contain arbitrary values
           type: object
+          properties:
+            objectivePars:
+              type: string
+              enum:
+                - result
+                - expected_minimum
         data:
           type: array
           items:
diff --git a/optimizerapi/optimizer.py b/optimizerapi/optimizer.py
index 0e268bd..8f4aa51 100644
--- a/optimizerapi/optimizer.py
+++ b/optimizerapi/optimizer.py
@@ -184,6 +184,8 @@ def process_result(result, optimizer, dimensions, cfg, extras, data, space):
     # as "None" at the moment.
     graph_format = extras.get("graphFormat", "png")
 
+    objective_pars = extras.get("objectivePars", "result")
+
     # In the following section details that should be reported to
     # clients should go into the "resultDetails" dictionary and plots
     # go into the "plots" list (this is handled by calling the "addPlot" function)
@@ -206,7 +208,8 @@ def process_result(result, optimizer, dimensions, cfg, extras, data, space):
 
                 plot_objective(model, dimensions=dimensions,
                                usepartialdependence=False,
-                               show_confidence=True)
+                               show_confidence=True, 
+                               pars=objective_pars)
                 add_plot(plots, f"objective_{idx}")
 
             if optimizer.n_objectives == 1: