diff --git a/11_day/bootpack.c b/11_day/bootpack.c
index 933ec49..76aa565 100644
--- a/11_day/bootpack.c
+++ b/11_day/bootpack.c
@@ -91,11 +91,11 @@ void HariMain(void)
 					if (my < 0) {
 						my = 0;
 					}
-					if (mx > binfo->scrnx - 16) {
-						mx = binfo->scrnx - 16;
+					if (mx > binfo->scrnx - 1) {
+						mx = binfo->scrnx - 1;
 					}
-					if (my > binfo->scrny - 16) {
-						my = binfo->scrny - 16;
+					if (my > binfo->scrny - 1) {
+						my = binfo->scrny - 1;
 					}
 					sprintf(s, "(%3d, %3d)", mx, my);
 					boxfill8(buf_back, binfo->scrnx, COL8_008484, 0, 0, 79, 15); /* 消坐标 */