point more clearly to the docs

diff --git a/raddb/mods-available/files b/raddb/mods-available/files
index cef8d90674f5f2d9d61ae46509ceb08f82b69caa..55ba8336fcf8e1c7b6db8aaa07575dccc9d3cf61 100644 (file)
--- a/raddb/mods-available/files
+++ b/raddb/mods-available/files
@@ -28,6 +28,11 @@ files {
        #
        #  The content of this attribute is used to match the `name` of the entry.
        #
+       #  Note that unlike v4, the key does not have to be a string, but could instead
+       #  be an IP address or netmask!  For more information, see
+       #
+       #       doc/antora/modules/raddb/pages/mods-config/files/users.adoc 
+       #
 #      key = "%{&Stripped-User-Name || &User-Name}"
 
        #