diff --git a/utils/test-pkg b/utils/test-pkg
index ce6e43b965..4ebfd9af66 100755
--- a/utils/test-pkg
+++ b/utils/test-pkg
@@ -257,6 +257,7 @@ Options:
 
     -d DIR, --build-dir DIR
         Do the builds in directory DIR, one sub-dir per toolchain.
+        If not specified, defaults to \${HOME}/br-test-pkg
 
     -p PKG, --package PKG
         Test-build the package PKG, by running 'make PKG'; if not specified,