diff --git a/README.md b/README.md
index ca578b4..2571cef 100644
--- a/README.md
+++ b/README.md
@@ -3,4 +3,4 @@ golang DNS echo server
 
 Usage:
 
-./echodns --sld echodns.xyz
+./echodns --sld echodns.xyz > echodns.log