diff --git a/datatables-buttons/datatables-buttons.d.ts b/datatables-buttons/datatables-buttons.d.ts
index fd047f0a8..8b6821323 100644
--- a/datatables-buttons/datatables-buttons.d.ts
+++ b/datatables-buttons/datatables-buttons.d.ts
@@ -82,6 +82,7 @@ declare module DataTables {
 
         exportOptions?: ButtonExportOptions;
         autoPrint?: boolean;
+        customize?: FunctionButtonCustomize;
     }
 
     export interface FunctionButtonAvailable {
@@ -109,5 +110,9 @@ declare module DataTables {
     export interface FunctionButtonAction {
         (e: any, dt: DataTables.DataTable, node: JQuery, config: any): void
     }
+
+    export interface FunctionButtonCustomize {
+        (win: Window): void
+    }
     //#endregion "button-settings
 }
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