diff --git a/packages/google-container/protos/google/container/v1/cluster_service.proto b/packages/google-container/protos/google/container/v1/cluster_service.proto
index 0f410bab4e33..4fb096621a9f 100644
--- a/packages/google-container/protos/google/container/v1/cluster_service.proto
+++ b/packages/google-container/protos/google/container/v1/cluster_service.proto
@@ -684,7 +684,9 @@ message NodeConfig {
   map<string, string> metadata = 4;
 
   // The image type to use for this node. Note that for a given image type,
-  // the latest version of it will be used.
+  // the latest version of it will be used. Please see
+  // https://cloud.google.com/kubernetes-engine/docs/concepts/node-images for
+  // available image types.
   string image_type = 5;
 
   // The map of Kubernetes labels (key/value pairs) to be applied to each node.
@@ -2299,7 +2301,9 @@ message UpdateNodePoolRequest {
   // - "-": picks the Kubernetes master version
   string node_version = 5 [(google.api.field_behavior) = REQUIRED];
 
-  // Required. The desired image type for the node pool.
+  // Required. The desired image type for the node pool. Please see
+  // https://cloud.google.com/kubernetes-engine/docs/concepts/node-images for
+  // available image types.
   string image_type = 6 [(google.api.field_behavior) = REQUIRED];
 
   // The name (project, location, cluster, node pool) of the node pool to
@@ -3527,7 +3531,9 @@ message AutoprovisioningNodePoolDefaults {
   // https://cloud.google.com/compute/docs/disks/customer-managed-encryption
   string boot_disk_kms_key = 9;
 
-  // The image type to use for NAP created node.
+  // The image type to use for NAP created node. Please see
+  // https://cloud.google.com/kubernetes-engine/docs/concepts/node-images for
+  // available image types.
   string image_type = 10;
 }
 
@@ -4596,7 +4602,8 @@ enum DatapathProvider {
 
 // Strategy used for node pool update.
 enum NodePoolUpdateStrategy {
-  // Default value.
+  // Default value if unset. GKE internally defaults the update strategy to
+  // SURGE for unspecified strategies.
   NODE_POOL_UPDATE_STRATEGY_UNSPECIFIED = 0;
 
   // blue-green upgrade.
diff --git a/packages/google-container/protos/google/container/v1beta1/cluster_service.proto b/packages/google-container/protos/google/container/v1beta1/cluster_service.proto
index 2bbbd5bcf19d..24922ac0a23a 100644
--- a/packages/google-container/protos/google/container/v1beta1/cluster_service.proto
+++ b/packages/google-container/protos/google/container/v1beta1/cluster_service.proto
@@ -676,7 +676,9 @@ message NodeConfig {
   map<string, string> metadata = 4;
 
   // The image type to use for this node. Note that for a given image type,
-  // the latest version of it will be used.
+  // the latest version of it will be used. Please see
+  // https://cloud.google.com/kubernetes-engine/docs/concepts/node-images for
+  // available image types.
   string image_type = 5;
 
   // The map of Kubernetes labels (key/value pairs) to be applied to each node.
@@ -2558,7 +2560,9 @@ message UpdateNodePoolRequest {
   // - "-": picks the Kubernetes master version
   string node_version = 5 [(google.api.field_behavior) = REQUIRED];
 
-  // Required. The desired image type for the node pool.
+  // Required. The desired image type for the node pool. Please see
+  // https://cloud.google.com/kubernetes-engine/docs/concepts/node-images for
+  // available image types.
   string image_type = 6 [(google.api.field_behavior) = REQUIRED];
 
   // The desired list of Google Compute Engine
@@ -3876,7 +3880,9 @@ message AutoprovisioningNodePoolDefaults {
   // https://cloud.google.com/compute/docs/disks/customer-managed-encryption
   string boot_disk_kms_key = 9;
 
-  // The image type to use for NAP created node.
+  // The image type to use for NAP created node. Please see
+  // https://cloud.google.com/kubernetes-engine/docs/concepts/node-images for
+  // available image types.
   string image_type = 10;
 }
 
@@ -4987,7 +4993,8 @@ message IdentityServiceConfig {
 
 // Strategy used for node pool update.
 enum NodePoolUpdateStrategy {
-  // Default value.
+  // Default value if unset. GKE internally defaults the update strategy to
+  // SURGE for unspecified strategies.
   NODE_POOL_UPDATE_STRATEGY_UNSPECIFIED = 0;
 
   // blue-green upgrade.
diff --git a/packages/google-container/samples/generated/v1/cluster_manager.update_node_pool.js b/packages/google-container/samples/generated/v1/cluster_manager.update_node_pool.js
index 49c673f51884..10715ac0d85c 100644
--- a/packages/google-container/samples/generated/v1/cluster_manager.update_node_pool.js
+++ b/packages/google-container/samples/generated/v1/cluster_manager.update_node_pool.js
@@ -41,7 +41,9 @@ function main(nodeVersion, imageType) {
    */
   // const nodeVersion = 'abc123'
   /**
-   *  Required. The desired image type for the node pool.
+   *  Required. The desired image type for the node pool. Please see
+   *  https://cloud.google.com/kubernetes-engine/docs/concepts/node-images for
+   *  available image types.
    */
   // const imageType = 'abc123'
   /**
diff --git a/packages/google-container/samples/generated/v1/snippet_metadata.google.container.v1.json b/packages/google-container/samples/generated/v1/snippet_metadata.google.container.v1.json
index 2ad2287804d5..f2a7a7754502 100644
--- a/packages/google-container/samples/generated/v1/snippet_metadata.google.container.v1.json
+++ b/packages/google-container/samples/generated/v1/snippet_metadata.google.container.v1.json
@@ -230,7 +230,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 154,
+                    "end": 156,
                     "type": "FULL"
                 }
             ],
diff --git a/packages/google-container/samples/generated/v1beta1/cluster_manager.update_node_pool.js b/packages/google-container/samples/generated/v1beta1/cluster_manager.update_node_pool.js
index fc69333ccee9..8f5b298a36ed 100644
--- a/packages/google-container/samples/generated/v1beta1/cluster_manager.update_node_pool.js
+++ b/packages/google-container/samples/generated/v1beta1/cluster_manager.update_node_pool.js
@@ -41,7 +41,9 @@ function main(projectId, zone, clusterId, nodePoolId, nodeVersion, imageType) {
    */
   // const nodeVersion = 'abc123'
   /**
-   *  Required. The desired image type for the node pool.
+   *  Required. The desired image type for the node pool. Please see
+   *  https://cloud.google.com/kubernetes-engine/docs/concepts/node-images for
+   *  available image types.
    */
   // const imageType = 'abc123'
   /**
diff --git a/packages/google-container/samples/generated/v1beta1/snippet_metadata.google.container.v1beta1.json b/packages/google-container/samples/generated/v1beta1/snippet_metadata.google.container.v1beta1.json
index d28a215f8165..5e0978cabf78 100644
--- a/packages/google-container/samples/generated/v1beta1/snippet_metadata.google.container.v1beta1.json
+++ b/packages/google-container/samples/generated/v1beta1/snippet_metadata.google.container.v1beta1.json
@@ -230,7 +230,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 158,
+                    "end": 160,
                     "type": "FULL"
                 }
             ],
diff --git a/packages/google-container/src/v1/cluster_manager_client.ts b/packages/google-container/src/v1/cluster_manager_client.ts
index d90a2e5b9467..8c52a823eb40 100644
--- a/packages/google-container/src/v1/cluster_manager_client.ts
+++ b/packages/google-container/src/v1/cluster_manager_client.ts
@@ -791,7 +791,9 @@ export class ClusterManagerClient {
    *   - "1.X.Y-gke.N": picks an explicit Kubernetes version
    *   - "-": picks the Kubernetes master version
    * @param {string} request.imageType
-   *   Required. The desired image type for the node pool.
+   *   Required. The desired image type for the node pool. Please see
+   *   https://cloud.google.com/kubernetes-engine/docs/concepts/node-images for
+   *   available image types.
    * @param {string} request.name
    *   The name (project, location, cluster, node pool) of the node pool to
    *   update. Specified in the format
diff --git a/packages/google-container/src/v1beta1/cluster_manager_client.ts b/packages/google-container/src/v1beta1/cluster_manager_client.ts
index 05d48525cec1..c5a3a28bbb9a 100644
--- a/packages/google-container/src/v1beta1/cluster_manager_client.ts
+++ b/packages/google-container/src/v1beta1/cluster_manager_client.ts
@@ -798,7 +798,9 @@ export class ClusterManagerClient {
    *   - "1.X.Y-gke.N": picks an explicit Kubernetes version
    *   - "-": picks the Kubernetes master version
    * @param {string} request.imageType
-   *   Required. The desired image type for the node pool.
+   *   Required. The desired image type for the node pool. Please see
+   *   https://cloud.google.com/kubernetes-engine/docs/concepts/node-images for
+   *   available image types.
    * @param {string[]} request.locations
    *   The desired list of Google Compute Engine
    *   [zones](https://cloud.google.com/compute/docs/zones#available) in which the