diff --git a/what-changed/model/info.go b/what-changed/model/info.go
index 4f933644..a1de09fe 100644
--- a/what-changed/model/info.go
+++ b/what-changed/model/info.go
@@ -11,8 +11,9 @@ import (
 // InfoChanges represents the number of changes to an Info object. Part of an OpenAPI document
 type InfoChanges struct {
 	*PropertyChanges
-	ContactChanges *ContactChanges `json:"contact,omitempty" yaml:"contact,omitempty"`
-	LicenseChanges *LicenseChanges `json:"license,omitempty" yaml:"license,omitempty"`
+	ContactChanges   *ContactChanges   `json:"contact,omitempty" yaml:"contact,omitempty"`
+	LicenseChanges   *LicenseChanges   `json:"license,omitempty" yaml:"license,omitempty"`
+	ExtensionChanges *ExtensionChanges `json:"extensions,omitempty" yaml:"extensions,omitempty"`
 }
 
 // GetAllChanges returns a slice of all changes made between Info objects
@@ -25,6 +26,9 @@ func (i *InfoChanges) GetAllChanges() []*Change {
 	if i.LicenseChanges != nil {
 		changes = append(changes, i.LicenseChanges.GetAllChanges()...)
 	}
+	if i.ExtensionChanges != nil {
+		changes = append(changes, i.ExtensionChanges.GetAllChanges()...)
+	}
 	return changes
 }
 
@@ -37,6 +41,9 @@ func (i *InfoChanges) TotalChanges() int {
 	if i.LicenseChanges != nil {
 		t += i.LicenseChanges.TotalChanges()
 	}
+	if i.ExtensionChanges != nil {
+		t += i.ExtensionChanges.TotalChanges()
+	}
 	return t
 }
 
@@ -139,6 +146,10 @@ func CompareInfo(l, r *base.Info) *InfoChanges {
 				l.License.ValueNode, nil, false, r.License.Value, nil)
 		}
 	}
+
+	// check extensions.
+	i.ExtensionChanges = CompareExtensions(l.Extensions, r.Extensions)
+
 	i.PropertyChanges = NewPropertyChanges(changes)
 	if i.TotalChanges() <= 0 {
 		return nil
diff --git a/what-changed/model/info_test.go b/what-changed/model/info_test.go
index 33396f53..82147da0 100644
--- a/what-changed/model/info_test.go
+++ b/what-changed/model/info_test.go
@@ -4,12 +4,13 @@
 package model
 
 import (
+	"testing"
+
 	"github.com/pb33f/libopenapi/datamodel/low"
 	"github.com/pb33f/libopenapi/datamodel/low/base"
-	"github.com/pb33f/libopenapi/datamodel/low/v3"
+	v3 "github.com/pb33f/libopenapi/datamodel/low/v3"
 	"github.com/stretchr/testify/assert"
 	"gopkg.in/yaml.v3"
-	"testing"
 )
 
 func TestCompareInfo_DescriptionAdded(t *testing.T) {
@@ -374,7 +375,8 @@ contact:
   name: buckaroo
   email: buckaroo@pb33f.io
 license:
-  name: MIT`
+  name: MIT
+x-extension: extension`
 
 	right := `title: a nice spec
 termsOfService: https://pb33f.io/terms
@@ -383,7 +385,8 @@ contact:
   name: buckaroo
   email: buckaroo@pb33f.io
 license:
-  name: MIT`
+  name: MIT
+x-extension: extension`
 
 	var lNode, rNode yaml.Node
 	_ = yaml.Unmarshal([]byte(left), &lNode)
@@ -401,3 +404,97 @@ license:
 	extChanges := CompareInfo(&lDoc, &rDoc)
 	assert.Nil(t, extChanges)
 }
+
+func TestCompareInfo_ExtensionAdded(t *testing.T) {
+
+	left := `title: a nice spec
+version: '1.2.3'
+`
+
+	right := `title: a nice spec
+version: '1.2.3'
+x-extension: new extension
+`
+
+	var lNode, rNode yaml.Node
+	_ = yaml.Unmarshal([]byte(left), &lNode)
+	_ = yaml.Unmarshal([]byte(right), &rNode)
+
+	// create low level objects
+	var lDoc base.Info
+	var rDoc base.Info
+	_ = low.BuildModel(lNode.Content[0], &lDoc)
+	_ = low.BuildModel(rNode.Content[0], &rDoc)
+	_ = lDoc.Build(nil, lNode.Content[0], nil)
+	_ = rDoc.Build(nil, rNode.Content[0], nil)
+
+	// compare.
+	extChanges := CompareInfo(&lDoc, &rDoc)
+	assert.Equal(t, 1, extChanges.TotalChanges())
+	assert.Len(t, extChanges.GetAllChanges(), 1)
+	assert.Equal(t, ObjectAdded, extChanges.ExtensionChanges.Changes[0].ChangeType)
+	assert.Equal(t, "x-extension", extChanges.ExtensionChanges.Changes[0].Property)
+}
+
+func TestCompareInfo_ExtensionRemoved(t *testing.T) {
+
+	left := `title: a nice spec
+version: '1.2.3'
+x-extension: extension
+`
+
+	right := `title: a nice spec
+version: '1.2.3'
+`
+
+	var lNode, rNode yaml.Node
+	_ = yaml.Unmarshal([]byte(left), &lNode)
+	_ = yaml.Unmarshal([]byte(right), &rNode)
+
+	// create low level objects
+	var lDoc base.Info
+	var rDoc base.Info
+	_ = low.BuildModel(lNode.Content[0], &lDoc)
+	_ = low.BuildModel(rNode.Content[0], &rDoc)
+	_ = lDoc.Build(nil, lNode.Content[0], nil)
+	_ = rDoc.Build(nil, rNode.Content[0], nil)
+
+	// compare.
+	extChanges := CompareInfo(&lDoc, &rDoc)
+	assert.Equal(t, 1, extChanges.TotalChanges())
+	assert.Len(t, extChanges.GetAllChanges(), 1)
+	assert.Equal(t, ObjectRemoved, extChanges.ExtensionChanges.Changes[0].ChangeType)
+	assert.Equal(t, "x-extension", extChanges.ExtensionChanges.Changes[0].Property)
+}
+
+func TestCompareInfo_ExtensionModified(t *testing.T) {
+
+	left := `title: a nice spec
+version: '1.2.3'
+x-extension: original extension
+`
+
+	right := `title: a nice spec
+version: '1.2.3'
+x-extension: new extension
+`
+
+	var lNode, rNode yaml.Node
+	_ = yaml.Unmarshal([]byte(left), &lNode)
+	_ = yaml.Unmarshal([]byte(right), &rNode)
+
+	// create low level objects
+	var lDoc base.Info
+	var rDoc base.Info
+	_ = low.BuildModel(lNode.Content[0], &lDoc)
+	_ = low.BuildModel(rNode.Content[0], &rDoc)
+	_ = lDoc.Build(nil, lNode.Content[0], nil)
+	_ = rDoc.Build(nil, rNode.Content[0], nil)
+
+	// compare.
+	extChanges := CompareInfo(&lDoc, &rDoc)
+	assert.Equal(t, 1, extChanges.TotalChanges())
+	assert.Len(t, extChanges.GetAllChanges(), 1)
+	assert.Equal(t, Modified, extChanges.ExtensionChanges.Changes[0].ChangeType)
+	assert.Equal(t, "x-extension", extChanges.ExtensionChanges.Changes[0].Property)
+}