diff --git a/pkg/apis/core/types.go b/pkg/apis/core/types.go
index 5697328e7d1..e570af7d597 100644
--- a/pkg/apis/core/types.go
+++ b/pkg/apis/core/types.go
@@ -415,7 +415,10 @@ type PersistentVolumeClaimSpec struct {
 	VolumeMode *PersistentVolumeMode
 	// If specified, volume will be prepopulated with data from the specified data source.
 	// This depends on the provisioner for this volume being able to use the specified source.
-	// If the provisioner does not support it, it will fail to provision the volume.
+	// If the provisioner does not support it, it will create an empty volume.
+	// It requires the VolumeSnapshotDataSource alpha feature gate to be enabled and
+	// currently VolumeSnapshot is the only supported data source.
+	// In the future, we will allow more data source types when new feature is ready.
 	// +optional
 	DataSource *TypedLocalObjectReference
 }
diff --git a/staging/src/k8s.io/api/core/v1/types.go b/staging/src/k8s.io/api/core/v1/types.go
index 3d086c97c7f..70853933fd2 100644
--- a/staging/src/k8s.io/api/core/v1/types.go
+++ b/staging/src/k8s.io/api/core/v1/types.go
@@ -458,9 +458,12 @@ type PersistentVolumeClaimSpec struct {
 	// This is an alpha feature and may change in the future.
 	// +optional
 	VolumeMode *PersistentVolumeMode `json:"volumeMode,omitempty" protobuf:"bytes,6,opt,name=volumeMode,casttype=PersistentVolumeMode"`
-	// If specified, volume will be prepopulated with data from the specified data source.
-	// This depends on the provisioner for this volume being able to use the specified source.
-	// If the provisioner does not support it, it will fail to provision the volume.
+        // If specified, volume will be prepopulated with data from the specified data source.
+        // This depends on the provisioner for this volume being able to use the specified source.
+        // If the provisioner does not support it, it will create an empty volume.
+        // It requires the VolumeSnapshotDataSource alpha feature gate to be enabled and
+        // currently VolumeSnapshot is the only supported data source.
+        // In the future, we will allow more data source types when new feature is ready.
 	// +optional
 	DataSource *TypedLocalObjectReference `json:"dataSource" protobuf:"bytes,7,opt,name=dataSource"`
 }