diff --git a/clndr/clndr-tests.ts b/clndr/clndr-tests.ts
index 828dfdf2a7..018d9a6000 100644
--- a/clndr/clndr-tests.ts
+++ b/clndr/clndr-tests.ts
@@ -71,6 +71,12 @@ const options: Clndr.ClndrOptions = {
 
 const myCalendar = $('.parent-element').clndr(options);
 
+myCalendar.options.constraints = {
+    startDate: '2017-12-22',
+    endDate: '2018-01-09'
+};
+myCalendar.render();
+
 myCalendar
     .forward()
     .back()
diff --git a/clndr/index.d.ts b/clndr/index.d.ts
index 12d84a6088..3e9fbbb09c 100644
--- a/clndr/index.d.ts
+++ b/clndr/index.d.ts
@@ -13,6 +13,10 @@ export as namespace Clndr;
  * The clndr instance
  */
 export interface ClndrInstance {
+    /**
+     * Get clndr options
+     */
+    options: ClndrOptions;
     /**
      * Go to the next month
      */
@@ -55,6 +59,10 @@ export interface ClndrInstance {
      * calendar.
      */
     removeEvents(filter: (event: any) => boolean): this;
+    /**
+     * Re-render of the calendar.
+     */
+    render(): void;
     /**
      * Destroy the clndr instance. This will empty the DOM node containing the
      * calendar.