diff --git a/google/cloud/auditmanager/v1/auditmanager.proto b/google/cloud/auditmanager/v1/auditmanager.proto
index 446a25ff67..4a9f789d03 100644
--- a/google/cloud/auditmanager/v1/auditmanager.proto
+++ b/google/cloud/auditmanager/v1/auditmanager.proto
@@ -367,8 +367,19 @@ message GenerateAuditReportRequest {
   // `NIST_800_53`.
   string compliance_framework = 5 [(google.api.field_behavior) = REQUIRED];
 
-  // Optional. If `true`, only validate the request and don't generate the audit
-  // report.
+  // Optional. If `true`, only validates the request and does not generate the
+  // audit report. This executes standard request validation (such as schema,
+  // framework existence, scope, and IAM checks) and skips the apply phase.
+  //
+  // Use this field for the following purposes:
+  // * **Infrastructure as Code (IaC)**: Allow tools like Terraform to run
+  //   dry-run mutations (e.g., `terraform plan`) without creating real
+  //   resources or incurring costs.
+  // * **User Interface Validation**: Enable real-time form and permission
+  //   validation in custom UIs before submitting requests.
+  // * **CI/CD & Automation**: Test your scripts, permissions, and parameters
+  //   safely without triggering expensive Long-Running Operations (LROs) or
+  //   consuming resource quotas.
   bool validate_only = 8 [(google.api.field_behavior) = OPTIONAL];
 }