Update overview.mdx

docs/queries/overview.mdx

@@ -105,6 +105,18 @@ const query = {
 
 Written in plain English, if the above query were passed to a `find` operation, it would translate to finding posts where either the `color` is `mint` OR the `color` is `white` AND `featured` is set to false.
 
+### Nested properties
+
+When working with nested properties, which can happen when using relational fields, it is possible to use the dot notation to access the nested property. For example, when working with a `Song` collection that has a `artists` field which is related to an `Artists` collection using the `name: 'artists'`. You can access a property within the collection `Artists` like so:
+
+```js
+const query = {
+  'artists.featured': { // nested property name to filter on
+    exists: true, // operator to use and boolean value that needs to be true
+  },
+}
+```
+
 ### GraphQL Find Queries
 
 All GraphQL `find` queries support the `where` argument, which accepts queries exactly as detailed above.