diff --git a/index.d.ts b/index.d.ts
index 1296650..5f22dff 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -69,6 +69,11 @@ export interface ShuffleOptions {
    */
   isCentered?: boolean;
 
+  /**
+   * Whether to align grid items to the right in the row.
+   */
+  isRTL?: boolean;
+
   /**
    * e.g. '.picture-item'.
    */
@@ -139,6 +144,10 @@ export interface InlineCssStyles {
 
 export interface ShuffleItemCss {
   INITIAL: InlineCssStyles;
+  DIRECTION: {
+    ltr: InlineCssStyles;
+    rtl: InlineCssStyles;
+  };
   VISIBLE: {
     before: InlineCssStyles;
     after: InlineCssStyles;