diff --git a/docs/计算机图形学/USTC ComputerGraphics.en.md b/docs/计算机图形学/USTC ComputerGraphics.en.md
index 150bcca5..aa21003e 100644
--- a/docs/计算机图形学/USTC ComputerGraphics.en.md	
+++ b/docs/计算机图形学/USTC ComputerGraphics.en.md	
@@ -15,5 +15,5 @@ Mr. Liu Ligang from the School of Mathematics at USTC uploaded the course during
 - Course Website:http://staff.ustc.edu.cn/~lgliu/Courses/ComputerGraphics_2020_spring-summer/default.htm
 - Recordings:https://www.bilibili.com/video/BV1iT4y1o7oM/?spm_id_from=333.880.my_history.page.click&vd_source=eea47a16439992e41b232bc5d5684e27
 - Textbooks:E. Angel, Interactive Computer Graphics — A top-down approach using OpenGL™, 6th ed., 2011.(This course does not prescribe the use of a prescribed textbook, and focuses on cutting-edge academic papers; the following textbooks are for reference only)
-- Assignments:http://staff.ustc.edu.cn/~lgliu/Courses/ComputerGraphics_2020_spring-summer/default.htm, 9 homework and 1project
+- Assignments:http://staff.ustc.edu.cn/~lgliu/Courses/ComputerGraphics_2020_spring-summer/default.htm, 9 homework and 1 project