diff --git a/what-changed/header_changes.go b/what-changed/header.go
similarity index 100%
rename from what-changed/header_changes.go
rename to what-changed/header.go
diff --git a/what-changed/items.go b/what-changed/items.go
new file mode 100644
index 0000000..55d8238
--- /dev/null
+++ b/what-changed/items.go
@@ -0,0 +1,67 @@
+// Copyright 2022 Princess B33f Heavy Industries / Dave Shanley
+// SPDX-License-Identifier: MIT
+
+package what_changed
+
+import (
+	v2 "github.com/pb33f/libopenapi/datamodel/low/v2"
+	v3 "github.com/pb33f/libopenapi/datamodel/low/v3"
+)
+
+type ItemsChanges struct {
+	PropertyChanges
+	ItemsChanges *ItemsChanges
+}
+
+func (i *ItemsChanges) TotalChanges() int {
+	c := i.PropertyChanges.TotalChanges()
+	if i.ItemsChanges != nil {
+		c += i.ItemsChanges.TotalChanges()
+	}
+	return c
+}
+
+func (i *ItemsChanges) TotalBreakingChanges() int {
+	c := i.PropertyChanges.TotalBreakingChanges()
+	if i.ItemsChanges != nil {
+		c += i.ItemsChanges.TotalBreakingChanges()
+	}
+	return c
+}
+
+func CompareItems(l, r *v2.Items) *ItemsChanges {
+
+	var changes []*Change
+	var props []*PropertyCheck
+
+	ic := new(ItemsChanges)
+
+	// header is identical to items, except for a description.
+	props = append(props, addSwaggerHeaderProperties(l, r, &changes)...)
+	CheckProperties(props)
+
+	if !l.Items.IsEmpty() && !r.Items.IsEmpty() {
+		// inline, check hashes, if they don't match, compare.
+		if l.Items.Value.Hash() != r.Items.Value.Hash() {
+			// compare.
+			ic.ItemsChanges = CompareItems(l.Items.Value, r.Items.Value)
+		}
+
+	}
+	if l.Items.IsEmpty() && !r.Items.IsEmpty() {
+		// added items
+		CreateChange(&changes, PropertyAdded, v3.ItemsLabel,
+			nil, r.Items.GetValueNode(), true, nil, r.Items.GetValue())
+	}
+	if !l.Items.IsEmpty() && r.Items.IsEmpty() {
+		// removed items
+		CreateChange(&changes, PropertyRemoved, v3.ItemsLabel,
+			l.Items.GetValueNode(), nil, true, l.Items.GetValue(),
+			nil)
+	}
+	ic.Changes = changes
+	if ic.TotalChanges() <= 0 {
+		return nil
+	}
+	return ic
+}
diff --git a/what-changed/items_test.go b/what-changed/items_test.go
new file mode 100644
index 0000000..6de0a0c
--- /dev/null
+++ b/what-changed/items_test.go
@@ -0,0 +1,175 @@
+// Copyright 2022 Princess B33f Heavy Industries / Dave Shanley
+// SPDX-License-Identifier: MIT
+
+package what_changed
+
+import (
+	"github.com/pb33f/libopenapi/datamodel/low"
+	"github.com/pb33f/libopenapi/datamodel/low/v2"
+	"github.com/pb33f/libopenapi/datamodel/low/v3"
+	"github.com/stretchr/testify/assert"
+	"gopkg.in/yaml.v3"
+	"testing"
+)
+
+func TestCompareItems(t *testing.T) {
+
+	left := `type: string`
+
+	right := `type: int`
+
+	var lNode, rNode yaml.Node
+	_ = yaml.Unmarshal([]byte(left), &lNode)
+	_ = yaml.Unmarshal([]byte(right), &rNode)
+
+	// create low level objects
+	var lDoc v2.Items
+	var rDoc v2.Items
+	_ = low.BuildModel(&lNode, &lDoc)
+	_ = low.BuildModel(&rNode, &rDoc)
+	_ = lDoc.Build(lNode.Content[0], nil)
+	_ = rDoc.Build(rNode.Content[0], nil)
+
+	// compare.
+	changes := CompareItems(&lDoc, &rDoc)
+	assert.NotNil(t, changes)
+	assert.Equal(t, 1, changes.TotalChanges())
+	assert.Equal(t, 1, changes.TotalBreakingChanges())
+	assert.Equal(t, v3.TypeLabel, changes.Changes[0].Property)
+}
+
+func TestCompareItems_RecursiveCheck(t *testing.T) {
+
+	left := `type: string
+items:
+  type: string`
+
+	right := `type: int
+items:
+  type: int`
+
+	var lNode, rNode yaml.Node
+	_ = yaml.Unmarshal([]byte(left), &lNode)
+	_ = yaml.Unmarshal([]byte(right), &rNode)
+
+	// create low level objects
+	var lDoc v2.Items
+	var rDoc v2.Items
+	_ = low.BuildModel(&lNode, &lDoc)
+	_ = low.BuildModel(&rNode, &rDoc)
+	_ = lDoc.Build(lNode.Content[0], nil)
+	_ = rDoc.Build(rNode.Content[0], nil)
+
+	// compare.
+	changes := CompareItems(&lDoc, &rDoc)
+	assert.NotNil(t, changes)
+	assert.Equal(t, 2, changes.TotalChanges())
+	assert.Equal(t, 2, changes.TotalBreakingChanges())
+	assert.Equal(t, 1, changes.ItemsChanges.TotalChanges())
+	assert.Equal(t, v3.TypeLabel, changes.Changes[0].Property)
+}
+
+func TestCompareItems_AddItems(t *testing.T) {
+
+	left := `type: int`
+
+	right := `type: int
+items:
+  type: int`
+
+	var lNode, rNode yaml.Node
+	_ = yaml.Unmarshal([]byte(left), &lNode)
+	_ = yaml.Unmarshal([]byte(right), &rNode)
+
+	// create low level objects
+	var lDoc v2.Items
+	var rDoc v2.Items
+	_ = low.BuildModel(&lNode, &lDoc)
+	_ = low.BuildModel(&rNode, &rDoc)
+	_ = lDoc.Build(lNode.Content[0], nil)
+	_ = rDoc.Build(rNode.Content[0], nil)
+
+	// compare.
+	changes := CompareItems(&lDoc, &rDoc)
+	assert.NotNil(t, changes)
+	assert.Equal(t, 1, changes.TotalChanges())
+	assert.Equal(t, 1, changes.TotalBreakingChanges())
+	assert.Equal(t, v3.ItemsLabel, changes.Changes[0].Property)
+	assert.Equal(t, PropertyAdded, changes.Changes[0].ChangeType)
+}
+
+func TestCompareItems_RemoveItems(t *testing.T) {
+
+	left := `type: int`
+
+	right := `type: int
+items:
+  type: int`
+
+	var lNode, rNode yaml.Node
+	_ = yaml.Unmarshal([]byte(left), &lNode)
+	_ = yaml.Unmarshal([]byte(right), &rNode)
+
+	// create low level objects
+	var lDoc v2.Items
+	var rDoc v2.Items
+	_ = low.BuildModel(&lNode, &lDoc)
+	_ = low.BuildModel(&rNode, &rDoc)
+	_ = lDoc.Build(lNode.Content[0], nil)
+	_ = rDoc.Build(rNode.Content[0], nil)
+
+	// compare.
+	changes := CompareItems(&rDoc, &lDoc)
+	assert.NotNil(t, changes)
+	assert.Equal(t, 1, changes.TotalChanges())
+	assert.Equal(t, 1, changes.TotalBreakingChanges())
+	assert.Equal(t, v3.ItemsLabel, changes.Changes[0].Property)
+	assert.Equal(t, PropertyRemoved, changes.Changes[0].ChangeType)
+}
+
+func TestCompareItems_RefVsInlineIdentical(t *testing.T) {
+
+	left := `swagger: 2.0
+definitions:
+  thing:
+    type: string
+    items:
+      $ref: '#/definitions/thang'
+  thang:
+    type: bool
+paths:
+  "/a/path":
+    get:
+      parameters:
+        - name: status
+          items:
+            $ref: '#/definitions/thing'`
+
+	right := `swagger: 2.0
+definitions:
+  thing:
+    type: string
+  thang:
+    type: int
+paths:
+  "/a/path":
+    get:
+      parameters:
+        - name: status
+          items:
+            type: string
+            items:
+              type: bool`
+
+	leftDoc, rightDoc := test_BuildDocv2(left, right)
+
+	// extract left reference schema and non reference schema.
+	lItems := leftDoc.Paths.Value.FindPath("/a/path").Value.Get.Value.Parameters.
+		Value[0].Value.Items.Value
+	rItems := rightDoc.Paths.Value.FindPath("/a/path").Value.Get.Value.Parameters.
+		Value[0].Value.Items.Value
+
+	// compare.
+	changes := CompareItems(lItems, rItems)
+	assert.Nil(t, changes)
+}