diff --git a/docs/chapter_searching/binary_search.md b/docs/chapter_searching/binary_search.md
index 04dbba8..0a407ff 100644
--- a/docs/chapter_searching/binary_search.md
+++ b/docs/chapter_searching/binary_search.md
@@ -328,7 +328,10 @@ $$
 === "Go"
 
     ```go title=""
-
+    // (i + j) 有可能超出 int 的取值范围
+    m := (i + j) / 2
+    // 更换为此写法则不会越界
+    m := i + (j - i) / 2
     ```
 
 === "JavaScript"