diff --git a/src/org/redkale/net/sncp/SncpClient.java b/src/org/redkale/net/sncp/SncpClient.java
index 3b53e32d6..187995739 100644
--- a/src/org/redkale/net/sncp/SncpClient.java
+++ b/src/org/redkale/net/sncp/SncpClient.java
@@ -118,8 +118,8 @@ public final class SncpClient {
     protected final Consumer<Runnable> executor;
 
     public SncpClient(final String serviceName, final Consumer<Runnable> executor, final long serviceid, boolean remote, final Class serviceClass,
-            boolean onlySncpDyn, final InetSocketAddress clientAddress, final HashSet<String> groups) {
-        if (serviceName.length() > 10) throw new RuntimeException(serviceClass + " @Resource name(" + serviceName + ") too long , must less 11");
+            boolean onlySncpDyn, final InetSocketAddress clientAddress, final HashSet<String> groups) { // 以下划线_开头的serviceName只能是被系统分配, 且长度可以超过11位
+        if (serviceName.length() > 10 && serviceName.charAt(0) != '_') throw new RuntimeException(serviceClass + " @Resource name(" + serviceName + ") too long , must less 11");
         this.remote = remote;
         this.executor = executor;
         this.serviceClass = serviceClass;
diff --git a/src/org/redkale/service/Service.java b/src/org/redkale/service/Service.java
index 94550a9fd..e93659943 100644
--- a/src/org/redkale/service/Service.java
+++ b/src/org/redkale/service/Service.java
@@ -9,6 +9,10 @@ import org.redkale.util.*;
 
 /**
  * 所有Service的实现类不得声明为final， 允许远程模式的public方法和public String name()方法都不能声明为final。
+ * 注意: 
+ * 1、"$"是一个很特殊的Service.name值 。 被标记为@Resource(name = "$") 的Service的资源名与所属父Service的资源名一致。
+ * 2、以下划线_开头的Service.name只能是被系统分配, 且长度可以超过11位。使用者定义name不得以_开头。
+ * 
  * <p>
  * @Resource(name = ".*")
  * private HashMap<String, XXXService> nodemap;