diff --git a/staging/src/k8s.io/cri-api/README.md b/staging/src/k8s.io/cri-api/README.md
index f778700ae57..53bfa0ae062 100644
--- a/staging/src/k8s.io/cri-api/README.md
+++ b/staging/src/k8s.io/cri-api/README.md
@@ -249,6 +249,21 @@ No changes
 - [Add image_id to CRI ContainerStatus message](https://github.com/kubernetes/kubernetes/pull/123583)
   - Added `image_id` field to type `ContainerStatus`
 
+### v1.31
+
+`git diff v1.30.0 v1.31.0 -- staging/src/k8s.io/cri-api/pkg/apis/runtime/v1/api.proto`
+
+- [KEP-3619: Add NodeStatus.Features.SupplementalGroupsPolicy API and e2e](https://github.com/kubernetes/kubernetes/pull/125470)
+  - Added `features` field to the type `StatusResponse` for the runtime to kubelet handshake on what features are supported
+
+- [KEP-3619: Fine-grained SupplementalGroups control](https://github.com/kubernetes/kubernetes/pull/117842)
+  - Added `supplemental_groups_policy` field to types `LinuxContainerSecurityContext` and `LinuxSandboxSecurityContext`
+  - Added `user` field to the type `ContainerStatus` to represent actual user for the container 
+
+- [[KEP-4639] Add OCI VolumeSource CRI API](https://github.com/kubernetes/kubernetes/pull/125659)
+  - Added `image` field to the type `Mount` to represent the OCI VolumeSource 
+
+
 ## Community, discussion, contribution, and support
 
 Learn how to engage with the Kubernetes community on the [community
diff --git a/staging/src/k8s.io/cri-api/pkg/apis/runtime/v1/api.pb.go b/staging/src/k8s.io/cri-api/pkg/apis/runtime/v1/api.pb.go
index d9f51eb05d4..a95dd6e3aaf 100644
--- a/staging/src/k8s.io/cri-api/pkg/apis/runtime/v1/api.pb.go
+++ b/staging/src/k8s.io/cri-api/pkg/apis/runtime/v1/api.pb.go
@@ -2217,7 +2217,7 @@ type PodSandboxStatusResponse struct {
 	Info map[string]string `protobuf:"bytes,2,rep,name=info,proto3" json:"info,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
 	// Container statuses
 	ContainersStatuses []*ContainerStatus `protobuf:"bytes,3,rep,name=containers_statuses,json=containersStatuses,proto3" json:"containers_statuses,omitempty"`
-	// Timestamp at which container and pod statuses were recorded
+	// Timestamp in nanoseconds at which container and pod statuses were recorded
 	Timestamp            int64    `protobuf:"varint,4,opt,name=timestamp,proto3" json:"timestamp,omitempty"`
 	XXX_NoUnkeyedLiteral struct{} `json:"-"`
 	XXX_sizecache        int32    `json:"-"`
@@ -9600,7 +9600,7 @@ type ContainerEventResponse struct {
 	ContainerId string `protobuf:"bytes,1,opt,name=container_id,json=containerId,proto3" json:"container_id,omitempty"`
 	// Type of the container event
 	ContainerEventType ContainerEventType `protobuf:"varint,2,opt,name=container_event_type,json=containerEventType,proto3,enum=runtime.v1.ContainerEventType" json:"container_event_type,omitempty"`
-	// Creation timestamp of this event
+	// Creation timestamp in nanoseconds of this event
 	CreatedAt int64 `protobuf:"varint,3,opt,name=created_at,json=createdAt,proto3" json:"created_at,omitempty"`
 	// Sandbox status
 	PodSandboxStatus *PodSandboxStatus `protobuf:"bytes,4,opt,name=pod_sandbox_status,json=podSandboxStatus,proto3" json:"pod_sandbox_status,omitempty"`
@@ -10027,7 +10027,7 @@ type Metric struct {
 	// otherwise, it will be ignored.
 	Name string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
 	// Timestamp should be 0 if the metric was gathered live.
-	// If it was cached, the Timestamp should reflect the time it was collected.
+	// If it was cached, the Timestamp should reflect the time in nanoseconds it was collected.
 	Timestamp  int64      `protobuf:"varint,2,opt,name=timestamp,proto3" json:"timestamp,omitempty"`
 	MetricType MetricType `protobuf:"varint,3,opt,name=metric_type,json=metricType,proto3,enum=runtime.v1.MetricType" json:"metric_type,omitempty"`
 	// The corresponding LabelValues to the LabelKeys defined in the MetricDescriptor.
diff --git a/staging/src/k8s.io/cri-api/pkg/apis/runtime/v1/api.proto b/staging/src/k8s.io/cri-api/pkg/apis/runtime/v1/api.proto
index 9938c6a60a8..bc1a1ccc58d 100644
--- a/staging/src/k8s.io/cri-api/pkg/apis/runtime/v1/api.proto
+++ b/staging/src/k8s.io/cri-api/pkg/apis/runtime/v1/api.proto
@@ -601,7 +601,7 @@ message PodSandboxStatusResponse {
     map<string, string> info = 2;
     // Container statuses
     repeated ContainerStatus containers_statuses = 3;
-    // Timestamp at which container and pod statuses were recorded
+    // Timestamp in nanoseconds at which container and pod statuses were recorded
     int64 timestamp = 4;
 }
 
@@ -1344,7 +1344,7 @@ message ContainerResources {
 
 message ContainerUser {
     // User identities initially attached to first process in the Linux container.
-	// Note that the actual running identity can be changed if the process has enough privilege to do so.
+    // Note that the actual running identity can be changed if the process has enough privilege to do so.
     LinuxContainerUser linux = 1;
 
     // User identities initially attached to first process in the Windows container
@@ -1863,7 +1863,7 @@ message ContainerEventResponse {
     // Type of the container event
     ContainerEventType container_event_type = 2;
 
-    // Creation timestamp of this event
+    // Creation timestamp in nanoseconds of this event
     int64 created_at = 3;
 
     // Sandbox status
@@ -1927,7 +1927,7 @@ message Metric {
     // otherwise, it will be ignored.
     string name = 1;
     // Timestamp should be 0 if the metric was gathered live.
-    // If it was cached, the Timestamp should reflect the time it was collected.
+    // If it was cached, the Timestamp should reflect the time in nanoseconds it was collected.
     int64 timestamp = 2;
     MetricType metric_type = 3;
     // The corresponding LabelValues to the LabelKeys defined in the MetricDescriptor.