diff --git a/crds/operators.coreos.com_installplans.yaml b/crds/operators.coreos.com_installplans.yaml
index d302575c1..0db207434 100644
--- a/crds/operators.coreos.com_installplans.yaml
+++ b/crds/operators.coreos.com_installplans.yaml
@@ -62,6 +62,7 @@ spec:
             properties:
               approval:
                 description: Approval is the user approval policy for an InstallPlan.
+                  It must be one of "Automatic" or "Manual".
                 type: string
               approved:
                 type: boolean
diff --git a/crds/operators.coreos.com_subscriptions.yaml b/crds/operators.coreos.com_subscriptions.yaml
index efa157f9a..bb936d384 100644
--- a/crds/operators.coreos.com_subscriptions.yaml
+++ b/crds/operators.coreos.com_subscriptions.yaml
@@ -1634,6 +1634,7 @@ spec:
                               type: string
               installPlanApproval:
                 description: Approval is the user approval policy for an InstallPlan.
+                  It must be one of "Automatic" or "Manual".
                 type: string
               name:
                 type: string
diff --git a/pkg/operators/v1alpha1/installplan_types.go b/pkg/operators/v1alpha1/installplan_types.go
index 41bbd429f..5c86f797b 100644
--- a/pkg/operators/v1alpha1/installplan_types.go
+++ b/pkg/operators/v1alpha1/installplan_types.go
@@ -14,6 +14,7 @@ const (
 )
 
 // Approval is the user approval policy for an InstallPlan.
+// It must be one of "Automatic" or "Manual".
 type Approval string
 
 const (