diff --git a/src/main/java/com/dsideal/QingLong/Collect/Controller/CollectController.java b/src/main/java/com/dsideal/QingLong/Collect/Controller/CollectController.java
index 158bafd4..5fd927bb 100644
--- a/src/main/java/com/dsideal/QingLong/Collect/Controller/CollectController.java
+++ b/src/main/java/com/dsideal/QingLong/Collect/Controller/CollectController.java
@@ -842,6 +842,7 @@ public class CollectController extends Controller {
             OutputStream out = response.getOutputStream();
             PDDocument document = PDDocument.load(FileUtil.readBytes(pdfPath)); //加载pdf
             PDDocumentInformation info = document.getDocumentInformation(); //获得文档属性对象
+            //对比原来的代码，就是在文件流写入响应体之前，经过一下pdfbox，修改标题属性，然后pdfbox的save方法可以直接写入到响应体中。
             info.setTitle(pdfName); //修改标题属性  这个标题会被展示
             document.setDocumentInformation(info);
             document.save(out); //修改完直接输出到响应体中