diff --git a/README.md b/README.md
index 9f69408..fa1e7a0 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,6 @@
 # lookup
 
-Batch lookup from hostname to ip and from ip to hostname
\ No newline at end of file
+Batch lookup from hostname to ip and from ip to hostname
+Usage:
+* ip2host.sh filename
+* host2ip.sh filename
\ No newline at end of file