diff --git a/src/lib/AnnotationControls.ts b/src/lib/AnnotationControls.ts
index f97d9fa95..c625dc027 100644
--- a/src/lib/AnnotationControls.ts
+++ b/src/lib/AnnotationControls.ts
@@ -6,9 +6,9 @@ export const CLASS_ANNOTATIONS_GROUP = 'bp-AnnotationControls-group';
 export const CLASS_REGION_BUTTON = 'bp-AnnotationControls-regionBtn';
 export const CLASS_BUTTON_ACTIVE = 'is-active';
 
-export type RegionHandlerType = ({ isRegionActive, event }: { isRegionActive: boolean; event: MouseEvent }) => void;
+export type RegionHandler = ({ isRegionActive, event }: { isRegionActive: boolean; event: MouseEvent }) => void;
 export type Options = {
-    onRegionClick?: RegionHandlerType;
+    onRegionClick?: RegionHandler;
 };
 
 declare const __: (key: string) => string;
@@ -37,11 +37,11 @@ export default class AnnotationControls {
     /**
      * Region comment button click handler
      *
-     * @param {RegionHandlerType} onRegionClick - region click handler in options
+     * @param {RegionHandler} onRegionClick - region click handler in options
      * @param {MouseEvent} event - mouse event
      * @return {void}
      */
-    private handleRegionClick = (onRegionClick: RegionHandlerType) => (event: MouseEvent): void => {
+    private handleRegionClick = (onRegionClick: RegionHandler) => (event: MouseEvent): void => {
         const regionButtonElement = event.target as HTMLButtonElement;
 
         this.isRegionActive = !this.isRegionActive;
@@ -57,7 +57,7 @@ export default class AnnotationControls {
     /**
      * Initialize the annotation controls with options.
      *
-     * @param {RegionHandlerType} [options.onRegionClick] - Callback when region comment button is clicked
+     * @param {RegionHandler} [options.onRegionClick] - Callback when region comment button is clicked
      * @return {void}
      */
     public init({ onRegionClick = noop }: Options = {}): void {