diff --git a/docs/1_5_0.md b/docs/1_5_0.md
index 70fc1830..fe6b2317 100644
--- a/docs/1_5_0.md
+++ b/docs/1_5_0.md
@@ -93,6 +93,7 @@ For example:
 
 ```cpp
 vm->bind__next__(type, [](VM* vm, PyObject* _0){
+    if(is_end) return vm->StopIteration;
     // ...
     PyObject* a = VAR(1);
     PyObject* b = VAR(2);
@@ -111,6 +112,7 @@ In `v1.5.0`, you need to use stack-based style to reimplement the above code:
 
 ```cpp
 vm->bind__next__(type, [](VM* vm, PyObject* _0) -> unsigned{
+    if(is_end) return 0;    // return 0 indicates StopIteration
     // ...
     PyObject* a = VAR(1);
     PyObject* b = VAR(2);