diff --git a/书籍与文档/电子书.md b/书籍与文档/电子书.md
index fd483aa..ad3d89f 100644
--- a/书籍与文档/电子书.md
+++ b/书籍与文档/电子书.md
@@ -9,4 +9,5 @@
 * https://www.academia.edu
 * https://bookboon.com
 * https://www.free-ebooks.net/
-* http://freecomputerbooks.com
\ No newline at end of file
+* http://freecomputerbooks.com
+*  https://issuu.com