diff --git a/client/src/main/java/com/vesoft/nebula/client/graph/net/NebulaPool.java b/client/src/main/java/com/vesoft/nebula/client/graph/net/NebulaPool.java
index e73ee52e2..3dd7bec2d 100644
--- a/client/src/main/java/com/vesoft/nebula/client/graph/net/NebulaPool.java
+++ b/client/src/main/java/com/vesoft/nebula/client/graph/net/NebulaPool.java
@@ -41,6 +41,7 @@ private List<HostAddress> hostToIp(List<HostAddress> addresses)
         throws UnknownHostException {
         List<HostAddress> newAddrs = new ArrayList<>();
         for (HostAddress addr : addresses) {
+            // get all host name
             InetAddress[] inetAddresses = InetAddress.getAllByName(addr.getHost());
             for (InetAddress inetAddress : inetAddresses) {
                 String ip = inetAddress.getHostAddress();