diff --git a/app/Enums/UpsellSource.php b/app/Enums/UpsellSource.php
index 0ccf0b9c..af7c35ba 100644
--- a/app/Enums/UpsellSource.php
+++ b/app/Enums/UpsellSource.php
@@ -7,6 +7,10 @@ namespace App\Enums;
  * attribute revenue to each upgrade prompt. The value is carried into Stripe as
  * subscription metadata and persisted onto the local subscription so revenue
  * can be measured per upsell point.
+ *
+ * Mirrored on the frontend by the UpsellSource union in
+ * resources/js/components/subscription/upgrade-dialog.tsx — keep both in sync
+ * when adding a point (an unknown value is silently dropped by tryFrom()).
  */
 enum UpsellSource: string
 {
diff --git a/resources/js/components/subscription/upgrade-dialog.tsx b/resources/js/components/subscription/upgrade-dialog.tsx
index f1e4316d..7bc70fd5 100644
--- a/resources/js/components/subscription/upgrade-dialog.tsx
+++ b/resources/js/components/subscription/upgrade-dialog.tsx
@@ -31,7 +31,6 @@ export function PlanCard({
     currency,
     locale,
 }: {
-    planKey: string;
     plan: Plan;
     isSelected: boolean;
     onSelect: () => void;
@@ -123,7 +122,6 @@ export function UpgradeDialog({
                     {planEntries.map(([key, plan]) => (
                         <PlanCard
                             key={key}
-                            planKey={key}
                             plan={plan}
                             isSelected={key === selectedPlan}
                             onSelect={() => setSelectedPlan(key)}
diff --git a/resources/js/pages/settings/billing.tsx b/resources/js/pages/settings/billing.tsx
index aecd64ab..92041649 100644
--- a/resources/js/pages/settings/billing.tsx
+++ b/resources/js/pages/settings/billing.tsx
@@ -139,7 +139,6 @@ function UpgradeSection({
                     {planEntries.map(([key, plan]) => (
                         <PlanCard
                             key={key}
-                            planKey={key}
                             plan={plan}
                             isSelected={key === selectedPlan}
                             onSelect={() => setSelectedPlan(key)}