diff --git a/8.16/J-LeadingandTrailing/Readme.md b/8.16/J-LeadingandTrailing/Readme.md
index 287f0a4..7ba6a70 100644
--- a/8.16/J-LeadingandTrailing/Readme.md
+++ b/8.16/J-LeadingandTrailing/Readme.md
@@ -16,5 +16,5 @@ n^k
 * log10(n^k)==k*log10(n)
 * pow(10,cur)==10^cur
 * %03d 001 000 整数用零补齐
-* y=modf(n,&x);n的小数部分给y,整数部分给x
+* y=modf(n,&x);n的小数部分给y,整数部分给x，都是浮点数！
 * 题解 https://www.cnblogs.com/KirinSB/p/9409120.html
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