diff --git a/nova_vm/src/builtins.rs b/nova_vm/src/builtins.rs
index a840bcf34..2ab3a0bc5 100644
--- a/nova_vm/src/builtins.rs
+++ b/nova_vm/src/builtins.rs
@@ -1,10 +1,16 @@
+//! # 10 Ordinary and Exotic Objects Behaviours
+//!
+//! Currently only contains code related to subsections 10.2, 10.3 and 10.4.
+//!
+//! https://tc39.es/ecma262/#sec-ordinary-and-exotic-objects-behaviours
+
 mod array;
 mod builtin_function;
 mod ecmascript_function;
 mod number;
 pub mod ordinary;
 
-pub use array::ArrayConstructor;
+pub use array::{ArrayConstructor, ArrayHeapData};
 pub use builtin_function::{
     create_builtin_function, todo_builtin, ArgumentsList, Behaviour, Builtin, BuiltinFunctionArgs,
     ConstructorFn, RegularFn as JsFunction, RegularFn,
diff --git a/nova_vm/src/builtins/array.rs b/nova_vm/src/builtins/array.rs
index b20cca7a3..24ad3458d 100644
--- a/nova_vm/src/builtins/array.rs
+++ b/nova_vm/src/builtins/array.rs
@@ -1,9 +1,27 @@
+//! ### 10.4.2 Array Exotic Objects
+//!
+//! https://tc39.es/ecma262/#sec-array-exotic-objects
+
 use super::{create_builtin_function, ArgumentsList, Behaviour, Builtin, BuiltinFunctionArgs};
 use crate::{
     execution::{Agent, JsResult},
+    heap::{element_array::ElementsVector, indexes::ObjectIndex},
     types::{Object, Value},
 };
 
+/// An Array is an exotic object that gives special treatment to array index property keys (see 6.1.7).
+/// A property whose property name is an array index is also called an element. Every Array has a
+/// non-configurable "**length**" property whose value is always a non-negative integral Number whose
+/// mathematical value is strictly less than 2**32.
+#[derive(Debug, Clone, Copy)]
+pub struct ArrayHeapData {
+    pub object_index: Option<ObjectIndex>,
+    // TODO: Use enum { ElementsVector, SmallVec<[Value; 3]> }
+    // to get some inline benefit together with a 32 byte size
+    // for ArrayHeapData to fit two in one cache line.
+    pub elements: ElementsVector,
+}
+
 pub struct ArrayConstructor;
 
 impl Builtin for ArrayConstructor {
diff --git a/nova_vm/src/heap.rs b/nova_vm/src/heap.rs
index 5931ce412..92d3c411c 100644
--- a/nova_vm/src/heap.rs
+++ b/nova_vm/src/heap.rs
@@ -19,7 +19,7 @@ mod symbol;
 
 pub use self::heap_constants::BuiltinObjectIndexes;
 use self::{
-    array::{initialize_array_heap, ArrayHeapData},
+    array::initialize_array_heap,
     array_buffer::{initialize_array_buffer_heap, ArrayBufferHeapData},
     bigint::{initialize_bigint_heap, BigIntHeapData},
     boolean::initialize_boolean_heap,
@@ -43,6 +43,7 @@ use self::{
     symbol::{initialize_symbol_heap, SymbolHeapData},
 };
 use crate::{
+    builtins::ArrayHeapData,
     execution::{Environments, Realm, RealmIdentifier},
     types::{Function, Number, Object, ObjectHeapData, PropertyKey, String, StringHeapData, Value},
 };
diff --git a/nova_vm/src/heap/array.rs b/nova_vm/src/heap/array.rs
index b4c120770..a91144cbf 100644
--- a/nova_vm/src/heap/array.rs
+++ b/nova_vm/src/heap/array.rs
@@ -1,8 +1,5 @@
 use super::{
-    element_array::ElementsVector,
-    function::FunctionHeapData,
-    heap_constants::WellKnownSymbolIndexes,
-    indexes::{FunctionIndex, ObjectIndex},
+    function::FunctionHeapData, heap_constants::WellKnownSymbolIndexes, indexes::FunctionIndex,
     object::ObjectEntry,
 };
 use crate::{
@@ -14,13 +11,6 @@ use crate::{
     types::{Object, PropertyKey, Value},
 };
 
-#[derive(Debug, Clone, Copy)]
-pub struct ArrayHeapData {
-    pub object_index: Option<ObjectIndex>,
-    // TODO: Use SmallVec<[Value; 4]>
-    pub elements: ElementsVector,
-}
-
 pub fn initialize_array_heap(heap: &mut Heap) {
     let species_function_name = Value::from_str(heap, "get [Symbol.species]");
     let at_key = PropertyKey::from_str(heap, "at");
diff --git a/nova_vm/src/heap/indexes.rs b/nova_vm/src/heap/indexes.rs
index eb360dbc7..1d0348e30 100644
--- a/nova_vm/src/heap/indexes.rs
+++ b/nova_vm/src/heap/indexes.rs
@@ -1,9 +1,9 @@
 use super::array_buffer::ArrayBufferHeapData;
 use super::{
-    array::ArrayHeapData, bigint::BigIntHeapData, date::DateHeapData, error::ErrorHeapData,
-    function::FunctionHeapData, number::NumberHeapData, regexp::RegExpHeapData,
-    symbol::SymbolHeapData,
+    bigint::BigIntHeapData, date::DateHeapData, error::ErrorHeapData, function::FunctionHeapData,
+    number::NumberHeapData, regexp::RegExpHeapData, symbol::SymbolHeapData,
 };
+use crate::builtins::ArrayHeapData;
 use crate::types::{ObjectHeapData, StringHeapData, Value};
 use crate::Heap;
 use core::fmt::Debug;