diff --git a/pkg/apis/core/types.go b/pkg/apis/core/types.go
index 5280cae0d9f..3c3252d7074 100644
--- a/pkg/apis/core/types.go
+++ b/pkg/apis/core/types.go
@@ -575,7 +575,7 @@ type GCEPersistentDiskVolumeSource struct {
 	PDName string
 	// Filesystem type to mount.
 	// Must be a filesystem type supported by the host operating system.
-	// Ex. "ext4", "xfs", "ntfs".
+	// Ex. "ext4", "xfs", "ntfs". Implicitly inferred to be "ext4" if unspecified.
 	// TODO: how do we prevent errors in the filesystem from compromising the machine
 	// +optional
 	FSType string
@@ -1523,7 +1523,7 @@ type CSIPersistentVolumeSource struct {
 
 	// Filesystem type to mount.
 	// Must be a filesystem type supported by the host operating system.
-	// Ex. "ext4", "xfs", "ntfs". Implicitly inferred to be "ext4" if unspecified.
+	// Ex. "ext4", "xfs", "ntfs".
 	// +optional
 	FSType string
 
diff --git a/staging/src/k8s.io/api/core/v1/types.go b/staging/src/k8s.io/api/core/v1/types.go
index 8967c602c6e..082dbc2773d 100644
--- a/staging/src/k8s.io/api/core/v1/types.go
+++ b/staging/src/k8s.io/api/core/v1/types.go
@@ -635,7 +635,7 @@ type RBDVolumeSource struct {
 	RBDImage string `json:"image" protobuf:"bytes,2,opt,name=image"`
 	// Filesystem type of the volume that you want to mount.
 	// Tip: Ensure that the filesystem type is supported by the host operating system.
-	// Examples: "ext4", "xfs", "ntfs".
+	// Examples: "ext4", "xfs", "ntfs". Implicitly inferred to be "ext4" if unspecified.
 	// More info: https://kubernetes.io/docs/concepts/storage/volumes#rbd
 	// TODO: how do we prevent errors in the filesystem from compromising the machine
 	// +optional
@@ -1611,7 +1611,7 @@ type CSIPersistentVolumeSource struct {
 
 	// Filesystem type to mount.
 	// Must be a filesystem type supported by the host operating system.
-	// Ex. "ext4", "xfs", "ntfs". Implicitly inferred to be "ext4" if unspecified.
+	// Ex. "ext4", "xfs", "ntfs".
 	// +optional
 	FSType string `json:"fsType,omitempty" protobuf:"bytes,4,opt,name=fsType"`