diff --git a/google/cloud/channel/v1/channel_partner_links.proto b/google/cloud/channel/v1/channel_partner_links.proto
index f688456a28..87b05c8543 100644
--- a/google/cloud/channel/v1/channel_partner_links.proto
+++ b/google/cloud/channel/v1/channel_partner_links.proto
@@ -16,11 +16,11 @@ syntax = "proto3";
 
 package google.cloud.channel.v1;
 
+import "google/api/annotations.proto";
 import "google/api/field_behavior.proto";
 import "google/api/resource.proto";
 import "google/cloud/channel/v1/common.proto";
 import "google/protobuf/timestamp.proto";
-import "google/api/annotations.proto";
 
 option go_package = "google.golang.org/genproto/googleapis/cloud/channel/v1;channel";
 option java_multiple_files = true;
@@ -43,7 +43,7 @@ enum ChannelPartnerLinkView {
 
 // ChannelPartnerLinkState represents state of a channel partner link.
 enum ChannelPartnerLinkState {
-  // The state is not specified.
+  // Not used.
   CHANNEL_PARTNER_LINK_STATE_UNSPECIFIED = 0;
 
   // An invitation has been sent to the reseller to create a channel partner
diff --git a/google/cloud/channel/v1/common.proto b/google/cloud/channel/v1/common.proto
index 9f9e697a22..94548abe20 100644
--- a/google/cloud/channel/v1/common.proto
+++ b/google/cloud/channel/v1/common.proto
@@ -16,9 +16,9 @@ syntax = "proto3";
 
 package google.cloud.channel.v1;
 
+import "google/api/annotations.proto";
 import "google/api/field_behavior.proto";
 import "google/protobuf/any.proto";
-import "google/api/annotations.proto";
 
 option go_package = "google.golang.org/genproto/googleapis/cloud/channel/v1;channel";
 option java_multiple_files = true;
@@ -29,7 +29,7 @@ option java_package = "com.google.cloud.channel.v1";
 message EduData {
   // Enum to specify the institute type.
   enum InstituteType {
-    // Default value.  This state doesn't show unless an error occurs.
+    // Not used.
     INSTITUTE_TYPE_UNSPECIFIED = 0;
 
     // Elementary/Secondary Schools & Districts
@@ -41,7 +41,7 @@ message EduData {
 
   // Number of students and staff the institute has.
   enum InstituteSize {
-    // Default value. This state doesn't show unless an error occurs.
+    // Not used.
     INSTITUTE_SIZE_UNSPECIFIED = 0;
 
     // 1 - 100
@@ -80,7 +80,7 @@ message EduData {
 message CloudIdentityInfo {
   // CustomerType of the customer
   enum CustomerType {
-    // Default value. This state doesn't show unless an error occurs.
+    // Not used.
     CUSTOMER_TYPE_UNSPECIFIED = 0;
 
     // Domain-owning customer which needs domain verification to use services.
diff --git a/google/cloud/channel/v1/customers.proto b/google/cloud/channel/v1/customers.proto
index 1ed316cae9..bd0b80f5bc 100644
--- a/google/cloud/channel/v1/customers.proto
+++ b/google/cloud/channel/v1/customers.proto
@@ -16,12 +16,12 @@ syntax = "proto3";
 
 package google.cloud.channel.v1;
 
+import "google/api/annotations.proto";
 import "google/api/field_behavior.proto";
 import "google/api/resource.proto";
 import "google/cloud/channel/v1/common.proto";
 import "google/protobuf/timestamp.proto";
 import "google/type/postal_address.proto";
-import "google/api/annotations.proto";
 
 option go_package = "google.golang.org/genproto/googleapis/cloud/channel/v1;channel";
 option java_multiple_files = true;
diff --git a/google/cloud/channel/v1/entitlements.proto b/google/cloud/channel/v1/entitlements.proto
index 95f2ec45fb..271e4b0002 100644
--- a/google/cloud/channel/v1/entitlements.proto
+++ b/google/cloud/channel/v1/entitlements.proto
@@ -16,6 +16,7 @@ syntax = "proto3";
 
 package google.cloud.channel.v1;
 
+import "google/api/annotations.proto";
 import "google/api/field_behavior.proto";
 import "google/api/resource.proto";
 import "google/cloud/channel/v1/common.proto";
@@ -23,7 +24,6 @@ import "google/cloud/channel/v1/offers.proto";
 import "google/cloud/channel/v1/products.proto";
 import "google/protobuf/timestamp.proto";
 import "google/protobuf/wrappers.proto";
-import "google/api/annotations.proto";
 
 option go_package = "google.golang.org/genproto/googleapis/cloud/channel/v1;channel";
 option java_multiple_files = true;
@@ -39,7 +39,7 @@ message Entitlement {
 
   // Indicates the current provisioning state of the entitlement.
   enum ProvisioningState {
-    // Default value. This state doesn't show unless an error occurs.
+    // Not used.
     PROVISIONING_STATE_UNSPECIFIED = 0;
 
     // The entitlement is currently active.
@@ -51,7 +51,7 @@ message Entitlement {
 
   // Suspension reason for an entitlement if [provisioning_state][google.cloud.channel.v1.Entitlement.provisioning_state] = SUSPENDED.
   enum SuspensionReason {
-    // Default value. This state doesn't show unless an error occurs.
+    // Not used.
     SUSPENSION_REASON_UNSPECIFIED = 0;
 
     // Entitlement was manually suspended by the Reseller.
@@ -226,7 +226,7 @@ message TransferableSku {
 message TransferEligibility {
   // Reason of ineligibility.
   enum Reason {
-    // Reason is not available.
+    // Not used.
     REASON_UNSPECIFIED = 0;
 
     // Reseller needs to accept TOS before transferring the SKU.
diff --git a/google/cloud/channel/v1/offers.proto b/google/cloud/channel/v1/offers.proto
index b566e8c6a2..42c8c16f41 100644
--- a/google/cloud/channel/v1/offers.proto
+++ b/google/cloud/channel/v1/offers.proto
@@ -16,13 +16,13 @@ syntax = "proto3";
 
 package google.cloud.channel.v1;
 
+import "google/api/annotations.proto";
 import "google/api/field_behavior.proto";
 import "google/api/resource.proto";
 import "google/cloud/channel/v1/common.proto";
 import "google/cloud/channel/v1/products.proto";
 import "google/protobuf/timestamp.proto";
 import "google/type/money.proto";
-import "google/api/annotations.proto";
 
 option go_package = "google.golang.org/genproto/googleapis/cloud/channel/v1;channel";
 option java_multiple_files = true;
diff --git a/google/cloud/channel/v1/operations.proto b/google/cloud/channel/v1/operations.proto
index 1d66d502e5..72e332164e 100644
--- a/google/cloud/channel/v1/operations.proto
+++ b/google/cloud/channel/v1/operations.proto
@@ -27,7 +27,7 @@ option java_package = "com.google.cloud.channel.v1";
 message OperationMetadata {
   // RPCs that return a Long Running Operation.
   enum OperationType {
-    // Default value. This state doesn't show unless an error occurs.
+    // Not used.
     OPERATION_TYPE_UNSPECIFIED = 0;
 
     // Long Running Operation was triggered by CreateEntitlement.
diff --git a/google/cloud/channel/v1/products.proto b/google/cloud/channel/v1/products.proto
index ee37f85de4..6be7c0bbf2 100644
--- a/google/cloud/channel/v1/products.proto
+++ b/google/cloud/channel/v1/products.proto
@@ -16,8 +16,8 @@ syntax = "proto3";
 
 package google.cloud.channel.v1;
 
-import "google/api/resource.proto";
 import "google/api/annotations.proto";
+import "google/api/resource.proto";
 
 option go_package = "google.golang.org/genproto/googleapis/cloud/channel/v1;channel";
 option java_multiple_files = true;
diff --git a/google/cloud/channel/v1/subscriber_event.proto b/google/cloud/channel/v1/subscriber_event.proto
index 3b6ec0452f..df7f07aa07 100644
--- a/google/cloud/channel/v1/subscriber_event.proto
+++ b/google/cloud/channel/v1/subscriber_event.proto
@@ -16,8 +16,8 @@ syntax = "proto3";
 
 package google.cloud.channel.v1;
 
-import "google/api/resource.proto";
 import "google/api/annotations.proto";
+import "google/api/resource.proto";
 
 option go_package = "google.golang.org/genproto/googleapis/cloud/channel/v1;channel";
 option java_multiple_files = true;
@@ -28,7 +28,7 @@ option java_package = "com.google.cloud.channel.v1";
 message CustomerEvent {
   // Type of customer event.
   enum Type {
-    // Default value. This state doesn't show unless an error occurs.
+    // Not used.
     TYPE_UNSPECIFIED = 0;
 
     // Primary domain for customer was changed.
@@ -52,7 +52,7 @@ message CustomerEvent {
 message EntitlementEvent {
   // Type of entitlement event.
   enum Type {
-    // Default value. This state doesn't show unless an error occurs.
+    // Not used.
     TYPE_UNSPECIFIED = 0;
 
     // A new entitlement was created.