diff --git a/packages/material-ui-lab/src/Timeline/Timeline.tsx b/packages/material-ui-lab/src/Timeline/Timeline.tsx
index ff8bbe330256c8..f64427aa74e389 100644
--- a/packages/material-ui-lab/src/Timeline/Timeline.tsx
+++ b/packages/material-ui-lab/src/Timeline/Timeline.tsx
@@ -39,6 +39,7 @@ export interface TimelineProps extends StandardProps<React.HTMLAttributes<HTMLUL
     /** Styles applied to the root element if `align="alternate"`. */
     alignAlternate?: string;
   };
+
   /**
    * className applied to the root element.
    */