diff --git a/Dockerfile.synchronizer b/Dockerfile.synchronizer
index b4fe6d7..be1eb0c 100644
--- a/Dockerfile.synchronizer
+++ b/Dockerfile.synchronizer
@@ -12,6 +12,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# docker build -t xosproject/vtn-synchronizer:candidate -f Dockerfile.synchronizer .
+
 # xosproject/vtn-synchronizer
 
 FROM xosproject/xos-synchronizer-base:candidate