diff --git a/docs/demos.json b/docs/demos.json
index f6944c7..220c730 100644
--- a/docs/demos.json
+++ b/docs/demos.json
@@ -240,7 +240,7 @@
             {
                 "name": "猜数游戏",
                 "irUrl": "demos/games/guess_game.ir",
-                "remark": "程序在[0,32768)内随机生成一个数字，请你来猜！猜小了会输出-1，猜大了会输出1。猜对了会输出什么？"
+                "remark": "程序在(-32768,32768)内随机生成一个数字，请你来猜！猜小了会输出-1，猜大了会输出1。猜对了会输出什么？"
             }
         ]
     },
diff --git a/docs/demos/games/guess_game.cmm b/docs/demos/games/guess_game.cmm
index a9cd578..ef2e45d 100644
--- a/docs/demos/games/guess_game.cmm
+++ b/docs/demos/games/guess_game.cmm
@@ -1,5 +1,5 @@
 /*
- * This program generates a secret random integer x in [0,32768).
+ * This program generates a secret random integer x in (-32768,32768).
  * Then you guess the number. If your entered value is less than x, you'll see -1.
  * Or if it's greater than x, you'll see 1. If you guess right, 666 will be written.
  */
diff --git a/public/demos.json b/public/demos.json
index f6944c7..220c730 100644
--- a/public/demos.json
+++ b/public/demos.json
@@ -240,7 +240,7 @@
             {
                 "name": "猜数游戏",
                 "irUrl": "demos/games/guess_game.ir",
-                "remark": "程序在[0,32768)内随机生成一个数字，请你来猜！猜小了会输出-1，猜大了会输出1。猜对了会输出什么？"
+                "remark": "程序在(-32768,32768)内随机生成一个数字，请你来猜！猜小了会输出-1，猜大了会输出1。猜对了会输出什么？"
             }
         ]
     },
diff --git a/public/demos/games/guess_game.cmm b/public/demos/games/guess_game.cmm
index a9cd578..ef2e45d 100644
--- a/public/demos/games/guess_game.cmm
+++ b/public/demos/games/guess_game.cmm
@@ -1,5 +1,5 @@
 /*
- * This program generates a secret random integer x in [0,32768).
+ * This program generates a secret random integer x in (-32768,32768).
  * Then you guess the number. If your entered value is less than x, you'll see -1.
  * Or if it's greater than x, you'll see 1. If you guess right, 666 will be written.
  */