minor fix

src/components/Stepper/index.js

@@ -56,13 +56,28 @@ export const Step = ({ children }) => {
 Stepper.Step = Step;
 
 Stepper.propTypes = {
+  /**
+   * The steps of the stepper. Should be Stepper.Step components.
+   */
   children: PropTypes.oneOfType([
     PropTypes.arrayOf(PropTypes.element),
     PropTypes.element,
   ]).isRequired,
+  /**
+   * Function to be called when the stepper is finished.
+   */
   onFinish: PropTypes.func.isRequired,
+  /**
+   * Function to validate each step. Should return true if valid, false otherwise.
+   */
   stepValidator: PropTypes.func,
+  /**
+   * Error message to display when a step is invalid.
+   */
   stepErrMessage: PropTypes.string,
+  /**
+   * Stepper orientation
+   */
   orientation: PropTypes.oneOf(["horizontal", "vertical"]),
 };