diff --git a/readme.md b/readme.md
index 70d8856..dbd59d8 100644
--- a/readme.md
+++ b/readme.md
@@ -79,7 +79,7 @@ Fedora, Firefox OS, FreeBSD, Debian, DragonFly, Gentoo, GNU, Haiku, Hurd, iOS,
 Joli, Linpus, Linux, Mac OS, Mageia, Mandriva, MeeGo, Minix, Mint, Morph OS, NetBSD, 
 Nintendo, OpenBSD, OpenVMS, OS/2, Palm, PC-BSD, PCLinuxOS, Plan9, Playstation, QNX, RedHat, 
 RIM Tablet OS, RISC OS, Sailfish, Series40, Slackware, Solaris, SUSE, Symbian, Tizen, 
-Ubuntu, UNIX, VectorLinux, WebOS, Windows [Phone/Mobile], Zenwalk
+Ubuntu, Unix, VectorLinux, WebOS, Windows [Phone/Mobile], Zenwalk
 
 # 'os.version' determined dynamically
 ```