diff --git a/plugins/optimization-detective/class-od-url-metrics-group-collection.php b/plugins/optimization-detective/class-od-url-metrics-group-collection.php
index ed9a16d427..b419b80544 100644
--- a/plugins/optimization-detective/class-od-url-metrics-group-collection.php
+++ b/plugins/optimization-detective/class-od-url-metrics-group-collection.php
@@ -471,7 +471,7 @@ public function count(): int {
 	 *                 complete: bool,
 	 *                 url_metrics: OD_URL_Metric[]
 	 *             }>
-	 *         } Data which can be serialized by json_encode.
+	 *         } Data which can be serialized by json_encode().
 	 */
 	public function jsonSerialize(): array {
 		return array(