diff --git a/apps/v1/generated.proto b/apps/v1/generated.proto
index d46373d92d..1bdc400b9d 100644
--- a/apps/v1/generated.proto
+++ b/apps/v1/generated.proto
@@ -759,6 +759,7 @@ message StatefulSetStatus {
 
   // Total number of available pods (ready for at least minReadySeconds) targeted by this statefulset.
   // This is a beta field and enabled/disabled by StatefulSetMinReadySeconds feature gate.
+  // +optional
   optional int32 availableReplicas = 11;
 }
 
diff --git a/apps/v1beta1/generated.proto b/apps/v1beta1/generated.proto
index 7f49e3eb54..53df96ee4d 100644
--- a/apps/v1beta1/generated.proto
+++ b/apps/v1beta1/generated.proto
@@ -514,6 +514,7 @@ message StatefulSetStatus {
 
   // Total number of available pods (ready for at least minReadySeconds) targeted by this StatefulSet.
   // This is a beta field and enabled/disabled by StatefulSetMinReadySeconds feature gate.
+  // +optional
   optional int32 availableReplicas = 11;
 }
 
diff --git a/apps/v1beta2/generated.proto b/apps/v1beta2/generated.proto
index f9e3ef7ef5..b5bc8c0cab 100644
--- a/apps/v1beta2/generated.proto
+++ b/apps/v1beta2/generated.proto
@@ -801,6 +801,7 @@ message StatefulSetStatus {
 
   // Total number of available pods (ready for at least minReadySeconds) targeted by this StatefulSet.
   // This is a beta field and enabled/disabled by StatefulSetMinReadySeconds feature gate.
+  // +optional
   optional int32 availableReplicas = 11;
 }