diff --git a/manifest/v1alpha/slo/slo.go b/manifest/v1alpha/slo/slo.go
index 2176c757..c5130c02 100644
--- a/manifest/v1alpha/slo/slo.go
+++ b/manifest/v1alpha/slo/slo.go
@@ -57,6 +57,7 @@ type Spec struct {
 	// Deprecated: this implementation of Composite will be removed and replaced with SLO.Spec.Objectives.Composite.
 	Composite     *Composite     `json:"composite,omitempty"`
 	AnomalyConfig *AnomalyConfig `json:"anomalyConfig,omitempty"`
+	Tier          string         `json:"tier,omitempty"`
 }
 
 // Attachment represents user defined URL attached to SLO.
diff --git a/manifest/v1alpha/slo/validation.go b/manifest/v1alpha/slo/validation.go
index 17dfa757..ffb86bdd 100644
--- a/manifest/v1alpha/slo/validation.go
+++ b/manifest/v1alpha/slo/validation.go
@@ -138,6 +138,9 @@ var specValidation = govy.New[Spec](
 			_, err := ParseBudgetingMethod(v)
 			return err
 		})),
+	govy.For(func(s Spec) string { return s.Tier }).
+		WithName("tier").
+		Rules(rules.StringLength(0, 63)),
 	govy.For(func(s Spec) string { return s.Service }).
 		WithName("service").
 		Required().