tools/etcd-test-proxy: godoc

Signed-off-by: Gyuho Lee <gyuhox@gmail.com>

tools/etcd-test-proxy/main.go

@@ -12,6 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// etcd-test-proxy is a proxy layer that simulates various network conditions.
 package main
 
 import (