diff --git a/docs/zh_CN/module/comx_gsm.md b/docs/zh_CN/module/comx_gsm.md
index a5b8bf5e..a6e46ad4 100644
--- a/docs/zh_CN/module/comx_gsm.md
+++ b/docs/zh_CN/module/comx_gsm.md
@@ -114,7 +114,7 @@
 
 - **Datasheet**
 
-    - [SIM800C datasheet](https://m5stack.oss-cn-shenzhen.aliyuncs.com/resource/docs/datasheet/module/SIM800C_datasheet.pdf）
+    - [SIM800C datasheet](https://m5stack.oss-cn-shenzhen.aliyuncs.com/resource/docs/datasheet/module/SIM800C_datasheet.pdf)
 
 -  **AT Command** 
     - [SIM800C AT指令表](https://m5stack.oss-cn-shenzhen.aliyuncs.com/resource/docs/datasheet/module/SIM800_Series_AT_Command_Manual_V1.09.pdf)