diff --git a/docs/usage.md b/docs/usage.md
index 3e6b581..d96cda7 100644
--- a/docs/usage.md
+++ b/docs/usage.md
@@ -151,6 +151,25 @@ with `phone` (property of the source object).
 
 > Note: the source and the target property must be of the same type for this to work.
 
+In order to set a default value for a property, you can use the `default` keyword:
+
+```yaml
+# config/packages/neusta_converter.yaml
+neusta_converter:
+    converter:
+      person.converter:
+        properties:
+          email:
+            source: ~
+            default: unknown
+          phoneNumber:
+            source: phone
+            default: 0123456789
+```
+
+Which will populate `email` with the value of the source property `email` or with the default value `unknown` if the
+source property is `null`.
+
 #### Mapping context
 
 If you just want to map a single property from the context to the target without transforming it in between, you don't