diff --git a/ChaCha20_DRBG.c b/ChaCha20_DRBG.c
index 4e7d370..92d06f0 100755
--- a/ChaCha20_DRBG.c
+++ b/ChaCha20_DRBG.c
@@ -504,6 +504,8 @@ void ChaCha20_DRBG_Instantiate_algorithm(uint8_t *entropy_input, int nonce,
   uint8_t *requested_bits;
   time_t timep;
 
+  // 此处memcpy存在堆溢出,
+  // 有个96字节的写入，错误是在一个66字节区域的正右方进行的写操作
   memcpy(seed_material, entropy_input, entropy_input_len);
   memcpy(seed_material + entropy_input_len, &nonce, sizeof(nonce));
   memcpy(seed_material + entropy_input_len + sizeof(nonce),