-# The configuration variables defined here are of the form ${foo}
-# They are local to this file, and do not change from request to
-# request.
+# See "man radiusd.conf" for documentation on the format of this
+# file. Note that the individual configuration items are NOT
+# documented in that "man" page. They are only documented here,
+# in the comments.
+#
+# As of 2.0.0, FreeRADIUS supports a simple processing language
+# in the "authorize", "authenticate", "accounting", etc. sections.
+# See "man unlang" for details.