diff --git a/github/event_types.go b/github/event_types.go
index 288b89ef4a3..df45ffbac3b 100644
--- a/github/event_types.go
+++ b/github/event_types.go
@@ -1210,18 +1210,21 @@ type PullRequestEvent struct {
 	PerformedViaGithubApp *App `json:"performed_via_github_app,omitempty"`
 }
 
-// PullRequestReviewEvent is triggered when a review is submitted on a pull
-// request.
+// PullRequestReviewEvent is triggered when a review on a pull request is
+// submitted, edited, or dismissed.
 // The Webhook event name is "pull_request_review".
 //
 // GitHub API docs: https://docs.github.com/developers/webhooks-and-events/webhook-events-and-payloads#pull_request_review
 type PullRequestReviewEvent struct {
-	// Action is always "submitted".
+	// Action is the action that was performed on the review.
+	// Possible values are: "submitted", "edited", "dismissed".
 	Action      *string            `json:"action,omitempty"`
 	Review      *PullRequestReview `json:"review,omitempty"`
 	PullRequest *PullRequest       `json:"pull_request,omitempty"`
 
 	// The following fields are only populated by Webhook events.
+	// Changes is populated in "edited" event deliveries.
+	Changes      *EditChange   `json:"changes,omitempty"`
 	Repo         *Repository   `json:"repository,omitempty"`
 	Sender       *User         `json:"sender,omitempty"`
 	Installation *Installation `json:"installation,omitempty"`
diff --git a/github/github-accessors.go b/github/github-accessors.go
index 6dbe7453e1b..581523c46b5 100644
--- a/github/github-accessors.go
+++ b/github/github-accessors.go
@@ -33550,6 +33550,14 @@ func (p *PullRequestReviewEvent) GetAction() string {
 	return *p.Action
 }
 
+// GetChanges returns the Changes field.
+func (p *PullRequestReviewEvent) GetChanges() *EditChange {
+	if p == nil {
+		return nil
+	}
+	return p.Changes
+}
+
 // GetInstallation returns the Installation field.
 func (p *PullRequestReviewEvent) GetInstallation() *Installation {
 	if p == nil {
diff --git a/github/github-accessors_test.go b/github/github-accessors_test.go
index c0eb4b2f8de..f41a7c8c751 100644
--- a/github/github-accessors_test.go
+++ b/github/github-accessors_test.go
@@ -42035,6 +42035,14 @@ func TestPullRequestReviewEvent_GetAction(tt *testing.T) {
 	p.GetAction()
 }
 
+func TestPullRequestReviewEvent_GetChanges(tt *testing.T) {
+	tt.Parallel()
+	p := &PullRequestReviewEvent{}
+	p.GetChanges()
+	p = nil
+	p.GetChanges()
+}
+
 func TestPullRequestReviewEvent_GetInstallation(tt *testing.T) {
 	tt.Parallel()
 	p := &PullRequestReviewEvent{}