diff --git a/docs/en/module/comx_gsm.md b/docs/en/module/comx_gsm.md
index 3791ca87..60bbc4b2 100644
--- a/docs/en/module/comx_gsm.md
+++ b/docs/en/module/comx_gsm.md
@@ -115,7 +115,7 @@
 
 - **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 Command](https://m5stack.oss-cn-shenzhen.aliyuncs.com/resource/docs/datasheet/module/SIM800_Series_AT_Command_Manual_V1.09.pdf)