diff --git a/src/index.tsx b/src/index.tsx
index b016e843..254eeabe 100644
--- a/src/index.tsx
+++ b/src/index.tsx
@@ -22,6 +22,7 @@ export interface TextareaAutosizeProps extends Omit<TextareaProps, 'style'> {
   onHeightChange?: (height: number, meta: TextareaHeightChangeMeta) => void;
   cacheMeasurements?: boolean;
   style?: Style;
+  className?: string;
 }
 
 const TextareaAutosize: React.ForwardRefRenderFunction<