diff --git a/src/NewModal.tsx b/src/NewModal.tsx
index 02e77b47..ea8aff70 100644
--- a/src/NewModal.tsx
+++ b/src/NewModal.tsx
@@ -45,7 +45,7 @@ export interface ModalProps extends AriaDialogProps {
    */
   // An option to leave the open state uncontrolled is intentionally not
   // provided, since modals are always opened due to external triggers, and it
-  // is the author's belief that controlled components lead to more obvious code
+  // is the author's belief that controlled components lead to more obvious code.
   open: boolean;
   /**
    * Callback for when the user dismisses the modal. If undefined, the modal