That way the user doesn't have to scroll through the
man page to find what it stands for.
On a side note, googling for "tao cd" is not helpful,
but googling "track at once" is.
diff --git a/usr.bin/cdio/cdio.1 b/usr.bin/cdio/cdio.1
index ff350ca8f..900449b0a 100644
@@ -45,7 +45,7 @@
program is a compact disc control utility,
-with support for playing audio CDs and TAO CD writing.
+with support for playing audio CDs and track-at-once (TAO) CD writing.
If no command is given,