diff --git a/common/src/main/java/com/github/dynamic/threadpool/common/constant/Constants.java b/common/src/main/java/com/github/dynamic/threadpool/common/constant/Constants.java
index f05e3ce9..cc40c294 100644
--- a/common/src/main/java/com/github/dynamic/threadpool/common/constant/Constants.java
+++ b/common/src/main/java/com/github/dynamic/threadpool/common/constant/Constants.java
@@ -12,6 +12,8 @@ public class Constants {
 
     public static final String ITEM_ID = "itemId";
 
+    public static final String NAMESPACE = "namespace";
+
     public static final String DEFAULT_NAMESPACE_ID = "public";
 
     public static final String NULL = "";