diff --git a/google/cloud/resourcesettings/v1/resource_settings.proto b/google/cloud/resourcesettings/v1/resource_settings.proto
index 16ba32e74e..c2e7f7dba6 100644
--- a/google/cloud/resourcesettings/v1/resource_settings.proto
+++ b/google/cloud/resourcesettings/v1/resource_settings.proto
@@ -27,6 +27,11 @@ option java_multiple_files = true;
 option java_outer_classname = "ResourceSettingsProto";
 option java_package = "com.google.cloud.resourcesettings.v1";
 
+// Client library namespace
+option csharp_namespace = "Google.Cloud.ResourceSettings.V1";
+option php_namespace = "Google\\Cloud\\ResourceSettings\\V1";
+option ruby_package = "Google::Cloud::ResourceSettings::V1";
+
 // An interface to interact with resource settings and setting values throughout
 // the resource hierarchy.
 //