diff --git a/pkg/apis/core/types.go b/pkg/apis/core/types.go
index cd1235b6c3e..a75ae941fa1 100644
--- a/pkg/apis/core/types.go
+++ b/pkg/apis/core/types.go
@@ -1264,6 +1264,7 @@ type ScaleIOVolumeSource struct {
 	// +optional
 	StoragePool string
 	// Indicates whether the storage for a volume should be ThickProvisioned or ThinProvisioned.
+	// Default is ThinProvisioned.
 	// +optional
 	StorageMode string
 	// The name of a volume already created in the ScaleIO system
@@ -1271,7 +1272,8 @@ type ScaleIOVolumeSource struct {
 	VolumeName string
 	// 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".
+	// Default is "xfs".
 	// +optional
 	FSType string
 	// Defaults to false (read/write). ReadOnly here will force
@@ -1300,6 +1302,7 @@ type ScaleIOPersistentVolumeSource struct {
 	// +optional
 	StoragePool string
 	// Indicates whether the storage for a volume should be ThickProvisioned or ThinProvisioned.
+	// Default is ThinProvisioned.
 	// +optional
 	StorageMode string
 	// The name of a volume created in the ScaleIO system
@@ -1307,7 +1310,8 @@ type ScaleIOPersistentVolumeSource struct {
 	VolumeName string
 	// 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".
+	// Default is "xfs".
 	// +optional
 	FSType string
 	// Defaults to false (read/write). ReadOnly here will force
diff --git a/staging/src/k8s.io/api/core/v1/types.go b/staging/src/k8s.io/api/core/v1/types.go
index b941e0ac2e0..99159ee75a6 100644
--- a/staging/src/k8s.io/api/core/v1/types.go
+++ b/staging/src/k8s.io/api/core/v1/types.go
@@ -1339,6 +1339,7 @@ type ScaleIOVolumeSource struct {
 	// +optional
 	StoragePool string `json:"storagePool,omitempty" protobuf:"bytes,6,opt,name=storagePool"`
 	// Indicates whether the storage for a volume should be ThickProvisioned or ThinProvisioned.
+	// Default is ThinProvisioned.
 	// +optional
 	StorageMode string `json:"storageMode,omitempty" protobuf:"bytes,7,opt,name=storageMode"`
 	// The name of a volume already created in the ScaleIO system
@@ -1346,7 +1347,8 @@ type ScaleIOVolumeSource struct {
 	VolumeName string `json:"volumeName,omitempty" protobuf:"bytes,8,opt,name=volumeName"`
 	// 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".
+	// Default is "xfs".
 	// +optional
 	FSType string `json:"fsType,omitempty" protobuf:"bytes,9,opt,name=fsType"`
 	// Defaults to false (read/write). ReadOnly here will force
@@ -1374,6 +1376,7 @@ type ScaleIOPersistentVolumeSource struct {
 	// +optional
 	StoragePool string `json:"storagePool,omitempty" protobuf:"bytes,6,opt,name=storagePool"`
 	// Indicates whether the storage for a volume should be ThickProvisioned or ThinProvisioned.
+	// Default is ThinProvisioned.
 	// +optional
 	StorageMode string `json:"storageMode,omitempty" protobuf:"bytes,7,opt,name=storageMode"`
 	// The name of a volume already created in the ScaleIO system
@@ -1381,7 +1384,8 @@ type ScaleIOPersistentVolumeSource struct {
 	VolumeName string `json:"volumeName,omitempty" protobuf:"bytes,8,opt,name=volumeName"`
 	// 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".
+	// Default is "xfs"
 	// +optional
 	FSType string `json:"fsType,omitempty" protobuf:"bytes,9,opt,name=fsType"`
 	// Defaults to false (read/write). ReadOnly here will force