diff --git a/src/lib/@types/index.d.ts b/src/lib/@types/index.d.ts
index 39f66215..fd065213 100644
--- a/src/lib/@types/index.d.ts
+++ b/src/lib/@types/index.d.ts
@@ -106,6 +106,11 @@ declare module 'simple-keyboard' {
      */
     disableCaretPositioning?: boolean;
 
+    /**
+     * Restrains input(s) change to the defined regular expression pattern.
+     */
+    inputPattern?: any;
+
     /**
      * Executes the callback function on key press. Returns button layout name (i.e.: "{shift}").
      */