diff --git a/blueprints/data-solutions/data-platform-foundations/README.md b/blueprints/data-solutions/data-platform-foundations/README.md
index 1e06da7ee..38b3c8623 100644
--- a/blueprints/data-solutions/data-platform-foundations/README.md
+++ b/blueprints/data-solutions/data-platform-foundations/README.md
@@ -226,7 +226,8 @@ module "data-platform" {
     billing_account_id = "123456-123456-123456"
     parent             = "folders/12345678"
   }
-  prefix = "myprefix"
+  # test 12-chars long prefix for FAST mt compatibility
+  prefix = "test-0123456"
 }
 # tftest modules=43 resources=293
 ```