Update _index.md

content/glossary/_index.md

@@ -15,10 +15,12 @@ Binding Expressions are relative to their parent bindings - see under 'Scoped Re
 ## Default Instance
 
 The 'default instance' in Fore is always the first in document order within a given `fx-fore` element. It will get an `id="default"` 
-being set if no `id` attribute exists. The default instance can be accessed by the `instance()` function without passing an argument.
+being set if no `id` attribute exists. The default instance can be either accessed by the `instance()` function without passing an argument or by `instance('default').
 
 The `instance()` function can be omitted in binding expressions if there's no non-default instance in scope. 
 
+The concept of a default instance allows to write binding expressions without explicitly naming the instance like e.g. `mypath/child` which will be equivalent to write `instance()/mypath/child` or `instance('default')/mypath/child`. As such it is mainly a convenience to reduce typing when accessing the first instance in document order.
+
 ## Id Resolution
 
 As Fore offers repeating sections via `fx-repeat` or `data-ref` there will be the situation that