diff --git a/operating-system.scm b/operating-system.scm
index f20e625..b2f3dee 100644
--- a/operating-system.scm
+++ b/operating-system.scm
@@ -13,6 +13,9 @@
 (id gnu-linux)
 (description "A GNU/Linux distribution")
 
+(id macosx)
+(description "Apple MacOS X operating system (see also: darwin)")
+
 (id netbsd)
 (description "The NetBSD operating system")