-* `type` can be "boolean", "string", "integer", or `undef` (use for complex
- types). Note that the type is the type of the leaf values; the `%config`
- option may be an array or hash of these.
-* `default` should be set to the default value of the option, if any.
-* `example` can be set to an example value, which will not be used by default.
+* `type` can be "boolean", "string", "integer", "internal" (used for values
+ that are not user-visible). The type is the type of the leaf values;
+ the `%config` option may be an array or hash of these.
+* `example` can be set to an example value.