diff --git a/framework-t/Android.bp b/framework-t/Android.bp
index 5ae1ef9..9e5ecb4 100644
--- a/framework-t/Android.bp
+++ b/framework-t/Android.bp
@@ -93,6 +93,9 @@
 
 // The filegroup lists files that are necessary for verifying building mdns as a standalone,
 // for use with service-connectivity-mdns-standalone-build-test
+// This filegroup should never be included in anywhere in the module build. It is only used for
+// building service-connectivity-mdns-standalone-build-test target. The files will be renamed by
+// copybara to prevent them from being shadowed by the bootclasspath copies.
 filegroup {
     name: "framework-connectivity-t-mdns-standalone-build-sources",
     srcs: [