diff --git a/src/lib/interfaces.ts b/src/lib/interfaces.ts
index cba5aa9f..a7b735d0 100644
--- a/src/lib/interfaces.ts
+++ b/src/lib/interfaces.ts
@@ -291,6 +291,11 @@ export interface KeyboardOptions {
      */
     onKeyReleased?: (button: string, e?: MouseEvent) => any;
 
+    /**
+     * Executes the callback function before an input is about to be updated
+     */
+    beforeInputUpdate?: (instance: SimpleKeyboard) => void;
+
     /**
      * Module options can have any format
      */