diff --git a/2.png b/2.png
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diff --git a/README.md b/README.md
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@@ -358,6 +358,8 @@ Step 3: if 打开文件失败 then 提示打开文件失败并结束
Step 4: 将所有库存记录写入文件
Step 5: 关闭文件
+! [](/mm.drawio.svg)
+
#### print_data
Step 1: 输出学号、姓名、成绩
diff --git a/save_data/mm.drawio.svg b/save_data/mm.drawio.svg
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diff --git a/save_data/nn.drawio b/save_data/nn.drawio
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