diff --git a/rst==1.md b/rst==1.md
index 3ce7518..252ee99 100644
--- a/rst==1.md
+++ b/rst==1.md
@@ -1,6 +1,6 @@
 You may get rst==1 in the following scenes:
 
-#### 1. You didnt run udp2raw with `-a` option, nor did you add the iptables rule needed by udp2raw manually. Then you may get rst==1 from either of the sides.
+#### 1. You didnt run udp2raw with `-a` option, nor did you add the necessary iptables rule manually. Then you may get rst==1 from either of the sides.
 
 In this case, you have to run udp2raw with `-a` option, or add iptables-rules manually(maybe with the help of `-g` option)