diff --git a/Design:-subflows.md b/Design:-subflows.md
index 7a3a8d0..a0ffc42 100644
--- a/Design:-subflows.md
+++ b/Design:-subflows.md
@@ -37,6 +37,17 @@ A subflow is represented as a single node in the workspace which can be opened u
 1. Open subflow edit dialog 
 2. Click delete
 
+### Difference between subflow and link node.
+There are some differences between subflow and link node.
+
+There are two cases about link node. A link out node wired to link in node in a same tab and a different tab.
+
+Condition                      | Subflow    | Link node (same tab)  | Link node (different tab)
+-------------------------------|------------|-----------------------|--------------------------
+Share context.flow             | NO         | YES                   | NO
+Share context.global           | YES        | YES                   | YES
+Catch error in caller tab      | YES        | YES                   | NO
+Node actions (e.g. inject node)| NO         | YES                   | YES
 
 ## Definition