diff --git a/docs/tutorials/services/source-ip.md b/docs/tutorials/services/source-ip.md
index 0df6c11f58..5ddb7e6da1 100644
--- a/docs/tutorials/services/source-ip.md
+++ b/docs/tutorials/services/source-ip.md
@@ -106,6 +106,7 @@ client_address=10.244.3.8
 command=GET
 ...
 ```
+If the client pod and server pod are in the same node, the client_address is the client pod's IP address. However, if the client pod and server pod are in different nodes, the client_address is the client pod's node flannel IP address.
 
 ## Source IP for Services with Type=NodePort