diff --git a/docs/nmap.usage.txt b/docs/nmap.usage.txt
index 13ca564c7..3325358ff 100644
--- a/docs/nmap.usage.txt
+++ b/docs/nmap.usage.txt
@@ -1,4 +1,4 @@
-Nmap 4.21ALPHA3 ( http://insecure.org )
+Nmap 4.21ALPHA4 ( http://insecure.org )
 Usage: nmap [Scan Type(s)] [Options] {target specification}
 TARGET SPECIFICATION:
   Can pass hostnames, IP addresses, networks, etc.