diff --git a/js/build-server.js b/js/build-server.js
index 9153f5ed2..f8c0eb828 100644
--- a/js/build-server.js
+++ b/js/build-server.js
@@ -13,6 +13,7 @@
 
 // You should have received a copy of the GNU General Public License
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
+// test only
 
 /**
  * Run `PARITY_URL="127.0.0.1:8180" NODE_ENV="production" npm run build`