diff --git a/src/Digdir.Domain.Dialogporten.Application/Features/V1/ServiceOwner/Dialogs/Commands/Create/CreateDialogCommandValidator.cs b/src/Digdir.Domain.Dialogporten.Application/Features/V1/ServiceOwner/Dialogs/Commands/Create/CreateDialogCommandValidator.cs
index c7b0c55d0..e35be4053 100644
--- a/src/Digdir.Domain.Dialogporten.Application/Features/V1/ServiceOwner/Dialogs/Commands/Create/CreateDialogCommandValidator.cs
+++ b/src/Digdir.Domain.Dialogporten.Application/Features/V1/ServiceOwner/Dialogs/Commands/Create/CreateDialogCommandValidator.cs
@@ -434,11 +434,11 @@ public CreateDialogDialogActivityDtoValidator(
             .When(x => x.Type != DialogActivityType.Values.Information);
         RuleFor(x => x.TransmissionId)
             .Null()
-            .WithMessage($"Only {nameof(DialogActivityType.Values.TransmissionOpened)} activity can reference a transmission.")
+            .WithMessage($"Only activities of type {nameof(DialogActivityType.Values.TransmissionOpened)} can reference a transmission.")
             .When(x => x.Type != DialogActivityType.Values.TransmissionOpened);
         RuleFor(x => x.TransmissionId)
             .NotEmpty()
-            .WithMessage($"A {nameof(DialogActivityType.Values.TransmissionOpened)} needs to reference a transmission.")
+            .WithMessage($"An activity of type {nameof(DialogActivityType.Values.TransmissionOpened)} needs to reference a transmission.")
             .When(x => x.Type == DialogActivityType.Values.TransmissionOpened);
     }
 }
diff --git a/src/Digdir.Domain.Dialogporten.Application/Features/V1/ServiceOwner/Dialogs/Commands/Update/UpdateDialogCommandValidator.cs b/src/Digdir.Domain.Dialogporten.Application/Features/V1/ServiceOwner/Dialogs/Commands/Update/UpdateDialogCommandValidator.cs
index c853763de..f7ea74dff 100644
--- a/src/Digdir.Domain.Dialogporten.Application/Features/V1/ServiceOwner/Dialogs/Commands/Update/UpdateDialogCommandValidator.cs
+++ b/src/Digdir.Domain.Dialogporten.Application/Features/V1/ServiceOwner/Dialogs/Commands/Update/UpdateDialogCommandValidator.cs
@@ -400,11 +400,11 @@ public UpdateDialogDialogActivityDtoValidator(
             .When(x => x.Type != DialogActivityType.Values.Information);
         RuleFor(x => x.TransmissionId)
             .Null()
-            .WithMessage($"Only {nameof(DialogActivityType.Values.TransmissionOpened)} activity can reference a transmission.")
+            .WithMessage($"Only activities of type {nameof(DialogActivityType.Values.TransmissionOpened)} can reference a transmission.")
             .When(x => x.Type != DialogActivityType.Values.TransmissionOpened);
         RuleFor(x => x.TransmissionId)
             .NotEmpty()
-            .WithMessage($"A {nameof(DialogActivityType.Values.TransmissionOpened)} needs to reference a transmission.")
+            .WithMessage($"An activity of type {nameof(DialogActivityType.Values.TransmissionOpened)} needs to reference a transmission.")
             .When(x => x.Type == DialogActivityType.Values.TransmissionOpened);
     }
 }