diff --git a/google/cloud/asset/v1/assets.proto b/google/cloud/asset/v1/assets.proto
index 97bc4872d..3d433b8f3 100644
--- a/google/cloud/asset/v1/assets.proto
+++ b/google/cloud/asset/v1/assets.proto
@@ -503,6 +503,14 @@ message ResourceSearchResult {
   // as to allow users to search on them.
   repeated AttachedResource attached_resources = 20;
 
+  // A map of related resources of this resource, keyed by the
+  // relationship type. A relationship type is in the format of
+  // {SourceType}_{ACTION}_{DestType}. Example: `DISK_TO_INSTANCE`,
+  // `DISK_TO_NETWORK`, `INSTANCE_TO_INSTANCEGROUP`.
+  // See [supported relationship
+  // types](https://cloud.google.com/asset-inventory/docs/supported-asset-types#supported_relationship_types).
+  map<string, RelatedResources> relationships = 21;
+
   // The type of this resource's immediate parent, if there is one.
   //
   // To search against the `parent_asset_type`:
@@ -558,6 +566,22 @@ message AttachedResource {
   repeated VersionedResource versioned_resources = 3;
 }
 
+// The related resources of the primary resource.
+message RelatedResources {
+  // The detailed related resources of the primary resource.
+  repeated RelatedResource related_resources = 1;
+}
+
+// The detailed related resource.
+message RelatedResource {
+  // The type of the asset. Example: `compute.googleapis.com/Instance`
+  string asset_type = 1;
+
+  // The full resource name of the related resource. Example:
+  // `//compute.googleapis.com/projects/my_proj_123/zones/instance/instance123`
+  string full_resource_name = 2;
+}
+
 // A result of IAM Policy search, containing information of an IAM policy.
 message IamPolicySearchResult {
   // Explanation about the IAM policy search result.