diff --git a/README.md b/README.md
index 99a4e47..35e707f 100644
--- a/README.md
+++ b/README.md
@@ -32,7 +32,7 @@ ping:
   interval: 2s
   timeout: 3s
   history-size: 42
-  size: 120
+  payload-size: 120
 
 options:
   disableIPv6: false