diff --git a/README.md b/README.md
index 60593e6..d8b2fcb 100644
--- a/README.md
+++ b/README.md
@@ -9,4 +9,5 @@ A simple recreation of ping (from inetutils-2.0) in C
 |    |    v|        |Set verbose|
 |    |    n|        |Numeric only, display only host ip|
 | ttl|     |0 < ttl <= 255|Change ttl (defautl=116)
-|    |    p|0 <= preload <= 2147483647|send a lot of packet before get recv|
\ No newline at end of file
+|    |    p|0 <= preload <= 2147483647|send packets before get recv|
+|    |    s|0 <= payload size <= 2147483647|send packet with a specific payload size|
\ No newline at end of file