diff --git a/src/discovery/4network.md b/src/discovery/4network.md
index 004df7611..61bbce66b 100644
--- a/src/discovery/4network.md
+++ b/src/discovery/4network.md
@@ -131,7 +131,7 @@ tag:
     
 - 拥塞控制，开环控制静态控制，闭环控制动态控制方式.
 
-- $\text{IPV4}$
+- $\text{IPv4}$
 
     - 首部长度$20\text B$