diff --git a/codes/cpp/chapter_hashing/simple_hash.cpp b/codes/cpp/chapter_hashing/simple_hash.cpp
index 66dc8b406..2cc0247b2 100644
--- a/codes/cpp/chapter_hashing/simple_hash.cpp
+++ b/codes/cpp/chapter_hashing/simple_hash.cpp
@@ -31,7 +31,6 @@ int xorHash(string key) {
     int hash = 0;
     const int MODULUS = 1000000007;
     for (unsigned char c : key) {
-        cout << (int)c << endl;
         hash ^= (int)c;
     }
     return hash & MODULUS;
diff --git a/docs/chapter_hashing/hash_algorithm.md b/docs/chapter_hashing/hash_algorithm.md
index 9f1fb152d..38acf2b8f 100644
--- a/docs/chapter_hashing/hash_algorithm.md
+++ b/docs/chapter_hashing/hash_algorithm.md
@@ -442,7 +442,7 @@ $$
 === "C"
 
     ```c title="built_in_hash.c"
-
+    // C 未提供内置 hash code 函数
     ```
 
 === "Zig"