diff --git a/docs/en/src/SUMMARY.md b/docs/en/src/SUMMARY.md
index 9e4fdd3d..e49d9cfa 100644
--- a/docs/en/src/SUMMARY.md
+++ b/docs/en/src/SUMMARY.md
@@ -3,39 +3,40 @@
 - [Introduction](introduction.md)
 - [Quickstart](quickstart.md)
 - [Type System](typesystem.md)
-    - [SimpleObject](define_simple_object.md)
-    - [Object](define_complex_object.md)
-        - [Context](context.md)
-        - [Error handling](error_handling.md)
-        - [Merging Objects / Subscriptions](merging_objects.md)
-        - [Derived fields](derived_fields.md)
-    - [Enum](define_enum.md)
-    - [Interface](define_interface.md)
-    - [Union](define_union.md)
-    - [InputObject](define_input_object.md)
-    - [Default value](default_value.md)
+  - [SimpleObject](define_simple_object.md)
+  - [Object](define_complex_object.md)
+    - [Context](context.md)
+    - [Error handling](error_handling.md)
+    - [Merging Objects / Subscriptions](merging_objects.md)
+    - [Derived fields](derived_fields.md)
+  - [Enum](define_enum.md)
+  - [Interface](define_interface.md)
+  - [Union](define_union.md)
+  - [InputObject](define_input_object.md)
+  - [OneofObject](define_one_of_object.md)
+  - [Default value](default_value.md)
 - [Schema](define_schema.md)
-    - [Query and Mutation](query_and_mutation.md)
-    - [Subscription](subscription.md)
-    - [SDL Export](sdl_export.md)
+  - [Query and Mutation](query_and_mutation.md)
+  - [Subscription](subscription.md)
+  - [SDL Export](sdl_export.md)
 - [Utilities](utilities.md)
-    - [Field guard](field_guard.md)
-    - [Input value validators](input_value_validators.md)
-    - [Cache control](cache_control.md)
-    - [Cursor connections](cursor_connections.md)
-    - [Error extensions](error_extensions.md)
-    - [Apollo Tracing](apollo_tracing.md)
-    - [Query complexity and depth](depth_and_complexity.md)
-    - [Hide content in introspection](visibility.md)
+  - [Field guard](field_guard.md)
+  - [Input value validators](input_value_validators.md)
+  - [Cache control](cache_control.md)
+  - [Cursor connections](cursor_connections.md)
+  - [Error extensions](error_extensions.md)
+  - [Apollo Tracing](apollo_tracing.md)
+  - [Query complexity and depth](depth_and_complexity.md)
+  - [Hide content in introspection](visibility.md)
 - [Extensions](extensions.md)
-    - [How extensions are working](extensions_inner_working.md)
-    - [Available extensions](extensions_available.md)
+  - [How extensions are working](extensions_inner_working.md)
+  - [Available extensions](extensions_available.md)
 - [Integrations](integrations.md)
-    - [Poem](integrations_to_poem.md)
-    - [Warp](integrations_to_warp.md)
-    - [Actix-web](integrations_to_actix_web.md)
+  - [Poem](integrations_to_poem.md)
+  - [Warp](integrations_to_warp.md)
+  - [Actix-web](integrations_to_actix_web.md)
 - [Advanced topics](advanced_topics.md)
-    - [Custom scalars](custom_scalars.md)
-    - [Optimizing N+1 queries](dataloader.md)
-    - [Custom directive](custom_directive.md)
-    - [Apollo Federation](apollo_federation.md)
+  - [Custom scalars](custom_scalars.md)
+  - [Optimizing N+1 queries](dataloader.md)
+  - [Custom directive](custom_directive.md)
+  - [Apollo Federation](apollo_federation.md)
diff --git a/docs/en/src/define_one_of_object.md b/docs/en/src/define_one_of_object.md
new file mode 100644
index 00000000..83d1f438
--- /dev/null
+++ b/docs/en/src/define_one_of_object.md
@@ -0,0 +1,36 @@
+# OneofObject
+
+A `OneofObject` is a special type of `InputObject`, in which only one of its fields must be set and is not-null.
+It is especially useful when you want a user to be able to choose between several potential input types.
+
+This feature is still an [RFC](https://github.com/graphql/graphql-spec/pull/825) and therefore not yet officially part of the GraphQL spec, but `Async-graphql` already supports it!
+
+```rust
+use async_graphql::*;
+
+#[derive(OneofObject)]
+enum UserBy {
+    Email(String),
+    RegistrationNumber(i64),
+    Address(Address)
+}
+
+#[derive(InputObject)]
+struct Address {
+    street: String,
+    house_number: String,
+    city: String,
+    zip: String,
+}
+
+struct Query {}
+
+#[Object]
+impl Query {
+    async fn search_users(&self, by: Vec<UserBy>) -> Vec<User> {
+        // ... Searches and returns a list of users ...
+    }
+}
+```
+
+As you can see, a `OneofObject` is represented by an `enum` in which each variant contains another `InputType`. This means that you can use [`InputObject`](define_input_object.md) as variant too.