diff --git a/addon/components/datepicker-support.js b/addon/components/datepicker-support.js
index 5538418..245c401 100644
--- a/addon/components/datepicker-support.js
+++ b/addon/components/datepicker-support.js
@@ -43,7 +43,8 @@ export default Ember.Mixin.create({
         todayHighlight: this.get('todayHighlight'),
         toggleActive: this.get('toggleActive'),
         weekStart: this.get('weekStart'),
-        datesDisabled: this.get('datesDisabled')
+        datesDisabled: this.get('datesDisabled'),
+        beforeShowDay: this.get('beforeShowDay')
       }).
       on('changeDate', event => {
         Ember.run(() => {
@@ -132,6 +133,12 @@ export default Ember.Mixin.create({
       this.$().data('datepicker')._process_options({format: format});
       this._updateDatepicker();
     });
+
+    this.addObserver('beforeShowDay', function() {
+      this.$().datepicker('beforeShowDay', this.get('beforeShowDay'));
+      this.$().data('datepicker')._process_options({beforeShowDay: this.get('beforeShowDay')});
+      this._updateDatepicker();
+    });
   }),
 
   _updateDatepicker: function() {