diff --git a/Known-issues-and-solutions.md b/Known-issues-and-solutions.md
index b79e383..56aa8bb 100644
--- a/Known-issues-and-solutions.md
+++ b/Known-issues-and-solutions.md
@@ -6,7 +6,7 @@ Some times you will get "Huge packet" warnings even if you have set MTU correctl
 Related issue:
 https://github.com/wangyu-/udp2raw-tunnel/issues/226
 
-### udp2raw server running with a common port (such as 443)
+### udp2raw server running on a common port (such as 443)
 
 If you run you udp2raw server on a common port such as 443, do not let udp2raw listen on `0.0.0.0`, let it listen on the specific IP instead.