diff --git a/ch09/README.md b/ch09/README.md
index e1579696..c9515fb4 100644
--- a/ch09/README.md
+++ b/ch09/README.md
@@ -94,11 +94,21 @@ const vector<int> v2;
 auto it1 = v1.begin(), it2 = v2.begin();
 auto it3 = v1.cbegin(), it4 = v2.cbegin();
 ```
-In gcc 4.8, will report error:
-error: inconsistent deduction for ‘auto’: ‘__gnu_cxx::__normal_iterator<int*, std::vector<int> >’ and then ‘__gnu_cxx::__normal_iterator<const int*, std::vector<int> >’ auto it1 = v1.begin(), it2 = v2.begin();
-the correct code should be
+
+-----
+
+[@shidenggui](https://github.com/shidenggui):
+
+The question example codes have an error in `gcc 4.8`:
+>**error**: inconsistent deduction for ‘auto’: ‘__gnu_cxx::__normal_iterator<int*, std::vector<int> >’ and then ‘__gnu_cxx::__normal_iterator<const int*, std::vector<int> >’ auto it1 = v1.begin(), it2 = v2.begin();
+
+the correct codes should be:
+```cpp
 auto it1 = v1.begin();
-auto  it2 = v2.begin(), it3 = v1.cbegin(), it4 = v2.cbegin();
+auto it2 = v2.begin(), it3 = v1.cbegin(), it4 = v2.cbegin();
+```
+
+-----
 
 `it1` is `vector<int>::iterator`