diff --git a/models/comment.go b/models/comment.go
index bd003c2..3d2e472 100644
--- a/models/comment.go
+++ b/models/comment.go
@@ -4,7 +4,7 @@ import "time"
 
 // A Comment is a comment on a chapter.
 type Comment struct {
-	ID            string    `bson:"id"`
+	ID            string    `bson:"_id"`
 	ChapterID     string    `bson:"chapterId"`
 	Subject       string    `bson:"subject"`
 	Author        string    `bson:"author"`