diff --git a/cookbook/pocketflow-visualization/visualize.py b/cookbook/pocketflow-visualization/visualize.py
index 937a36b..6caf215 100644
--- a/cookbook/pocketflow-visualization/visualize.py
+++ b/cookbook/pocketflow-visualization/visualize.py
@@ -28,28 +28,31 @@ def build_mermaid(start):
             ids[n] if n in ids else (ids.setdefault(n, f"N{ctr}"), (ctr := ctr + 1))[0]
         )
 
-    def link(a, b):
-        lines.append(f"    {a} --> {b}")
+    def link(a, b, action=None):
+        if action:
+            lines.append(f"    {a} -->|{action}| {b}")
+        else:
+            lines.append(f"    {a} --> {b}")
 
-    def walk(node, parent=None):
+    def walk(node, parent=None, action=None):
         if node in visited:
-            return parent and link(parent, get_id(node))
+            return parent and link(parent, get_id(node), action)
         visited.add(node)
         if isinstance(node, Flow):
-            node.start_node and parent and link(parent, get_id(node.start_node))
+            node.start_node and parent and link(parent, get_id(node.start_node), action)
             lines.append(
                 f"\n    subgraph sub_flow_{get_id(node)}[{type(node).__name__}]"
             )
             node.start_node and walk(node.start_node)
-            for nxt in node.successors.values():
-                node.start_node and walk(nxt, get_id(node.start_node)) or (
-                    parent and link(parent, get_id(nxt))
-                ) or walk(nxt)
+            for act, nxt in node.successors.items():
+                node.start_node and walk(nxt, get_id(node.start_node), act) or (
+                    parent and link(parent, get_id(nxt), action)
+                ) or walk(nxt, None, act)
             lines.append("    end\n")
         else:
             lines.append(f"    {(nid := get_id(node))}['{type(node).__name__}']")
-            parent and link(parent, nid)
-            [walk(nxt, nid) for nxt in node.successors.values()]
+            parent and link(parent, nid, action)
+            [walk(nxt, nid, act) for act, nxt in node.successors.items()]
 
     walk(start)
     return "\n".join(lines)