Index: Ringtoets/Integration/src/Ringtoets.Integration.Forms/Views/AssemblyResultTotalView.cs
===================================================================
diff -u -r0a1e00c14da142df178d43f87af86906f170842b -r299e146af0e5e51db326806c46d169241cb634ca
--- Ringtoets/Integration/src/Ringtoets.Integration.Forms/Views/AssemblyResultTotalView.cs	(.../AssemblyResultTotalView.cs)	(revision 0a1e00c14da142df178d43f87af86906f170842b)
+++ Ringtoets/Integration/src/Ringtoets.Integration.Forms/Views/AssemblyResultTotalView.cs	(.../AssemblyResultTotalView.cs)	(revision 299e146af0e5e51db326806c46d169241cb634ca)
@@ -53,8 +53,8 @@
     /// </summary>
     public partial class AssemblyResultTotalView : UserControl, IView
     {
-        private IEnumerable<FailureMechanismAssemblyResultRowBase> assemblyResultRows;
         private readonly Observer assessmentSectionResultObserver;
+        private IEnumerable<FailureMechanismAssemblyResultRowBase> assemblyResultRows;
 
         /// <summary>
         /// Creates a new instance of <see cref="AssemblyResultTotalView"/>.
@@ -73,20 +73,14 @@
 
             InitializeComponent();
 
+            warningProvider.SetIconPadding(RefreshAssemblyResultsButton, 4);
+
             assessmentSectionResultObserver = new Observer(EnableRefreshButton)
             {
                 Observable = new AssessmentSectionResultObserver(assessmentSection)
             };
         }
 
-        private void EnableRefreshButton()
-        {
-            if (!RefreshAssemblyResultsButton.Enabled)
-            {
-                RefreshAssemblyResultsButton.Enabled = true;
-            }
-        }
-
         /// <summary>
         /// Gets the <see cref="AssessmentSection"/> the view belongs to.
         /// </summary>
@@ -117,6 +111,16 @@
             base.Dispose(disposing);
         }
 
+        private void EnableRefreshButton()
+        {
+            if (!RefreshAssemblyResultsButton.Enabled)
+            {
+                RefreshAssemblyResultsButton.Enabled = true;
+                warningProvider.SetError(RefreshAssemblyResultsButton,
+                                         Resources.AssemblyResultView_RefreshAssemblyResultsButton_Result_is_outdated_Press_Refresh_button_to_recalculate);
+            }
+        }
+
         private void InitializeDataGridView()
         {
             dataGridViewControl.AddTextBoxColumn(nameof(FailureMechanismAssemblyResultRowBase.Name),
@@ -172,6 +176,8 @@
         private void RefreshAssemblyResults_Click(object sender, EventArgs e)
         {
             RefreshAssemblyResultsButton.Enabled = false;
+            warningProvider.SetError(RefreshAssemblyResultsButton, string.Empty);
+
             assemblyResultRows.ForEachElementDo(row => row.Update());
             dataGridViewControl.RefreshDataGridView();
             UpdateAssemblyResultControls();