diff --git a/google/cloud/billing/budgets/v1beta1/BUILD.bazel b/google/cloud/billing/budgets/v1beta1/BUILD.bazel
index 384b4cef..86397400 100644
--- a/google/cloud/billing/budgets/v1beta1/BUILD.bazel
+++ b/google/cloud/billing/budgets/v1beta1/BUILD.bazel
@@ -309,8 +309,8 @@ csharp_grpc_library(
 csharp_gapic_library(
     name = "budgets_csharp_gapic",
     srcs = [":budgets_proto_with_info"],
-    grpc_service_config = "billingbudgets_grpc_service_config.json",
     common_resources_config = "@gax_dotnet//:Google.Api.Gax/ResourceNames/CommonResourcesConfig.json",
+    grpc_service_config = "billingbudgets_grpc_service_config.json",
     deps = [
         ":budgets_csharp_grpc",
         ":budgets_csharp_proto",
diff --git a/google/cloud/billing/budgets/v1beta1/budget_model.proto b/google/cloud/billing/budgets/v1beta1/budget_model.proto
index 327069b6..10f149fe 100644
--- a/google/cloud/billing/budgets/v1beta1/budget_model.proto
+++ b/google/cloud/billing/budgets/v1beta1/budget_model.proto
@@ -153,8 +153,9 @@ message AllUpdatesRule {
       [(google.api.field_behavior) = OPTIONAL];
 
   // Optional. When set to true, disables default notifications sent when a
-  // threshold is exceeded. Recipients are those with Billing Account
-  // Administrators and Billing Account Users IAM roles for the target account.
+  // threshold is exceeded. Default notifications are sent to those with Billing
+  // Account Administrator and Billing Account User IAM roles for the target
+  // account.
   bool disable_default_iam_recipients = 4
       [(google.api.field_behavior) = OPTIONAL];
 }
@@ -173,6 +174,10 @@ message Filter {
     // All types of credit are added to the net cost to determine the spend for
     // threshold calculations.
     EXCLUDE_ALL_CREDITS = 2;
+
+    // Credit types specified in the credit_types field are subtracted from the
+    // gross cost to determine the spend for threshold calculations.
+    INCLUDE_SPECIFIED_CREDITS = 3;
   }
 
   // Optional. A set of projects of the form `projects/{project}`,
@@ -182,6 +187,15 @@ message Filter {
   // Only zero or one project can be specified currently.
   repeated string projects = 1 [(google.api.field_behavior) = OPTIONAL];
 
+  // Optional. A list of credit types to be subtracted from gross cost to
+  // determine the spend for threshold calculations if and only if
+  // credit_types_treatment is INCLUDE_SPECIFIED_CREDITS. If
+  // credit_types_treatment is not INCLUDE_SPECIFIED_CREDITS, this field must be
+  // empty. See credits.type at
+  // https://cloud.google.com/billing/docs/how-to/export-data-bigquery-tables#data-schema
+  // for a list of acceptable credit type values in this field.
+  repeated string credit_types = 7 [(google.api.field_behavior) = OPTIONAL];
+
   // Optional. If not set, default behavior is `INCLUDE_ALL_CREDITS`.
   CreditTypesTreatment credit_types_treatment = 4
       [(google.api.field_behavior) = OPTIONAL];