diff --git a/solutions/166. Fraction to Recurring Decimal.md b/solutions/166. Fraction to Recurring Decimal.md
index 42907ba..64c45cd 100644
--- a/solutions/166. Fraction to Recurring Decimal.md	
+++ b/solutions/166. Fraction to Recurring Decimal.md	
@@ -13,6 +13,9 @@
 
 考虑无限循环小数该怎么办呢? 前面说到, 在循环里r是会不断更新的, 所以我们需记录每次循环r的值, 这样当r重复时, 就可以将两次循环之间得到的结果用括号括起来.
 
+**注意整数转字符串可以很方便地用to_string(), 另外insert对字符串进行插入.**
+
+
 # C++
 ``` C++
 class Solution {