diff --git a/github/payload.go b/github/payload.go
index 37836dc..edab024 100644
--- a/github/payload.go
+++ b/github/payload.go
@@ -4809,6 +4809,9 @@ type PullRequestReviewCommentPayload struct {
 		Type              string `json:"type"`
 		SiteAdmin         bool   `json:"site_admin"`
 	} `json:"sender"`
+	Installation struct {
+		ID int64 `json:"id"`
+	} `json:"installation"`
 }
 
 // PushPayload contains the information for GitHub's push hook event