diff --git a/src/directives/mwlCalendar.js b/src/directives/mwlCalendar.js
index 4ad9ef78..50be29a8 100644
--- a/src/directives/mwlCalendar.js
+++ b/src/directives/mwlCalendar.js
@@ -35,21 +35,27 @@ angular
     var previousView = vm.view;
 
     function eventIsValid(event) {
+      var LOG_PREFIX = 'Bootstrap calendar:';
       if (!event.startsAt) {
-        $log.warn('Bootstrap calendar: ', 'Event is missing the startsAt field', event);
+        $log.warn(LOG_PREFIX, 'Event is missing the startsAt field', event);
       } else if (!angular.isDate(event.startsAt)) {
-        $log.warn('Bootstrap calendar: ', 'Event startsAt should be a javascript date object. Do `new Date(event.startsAt)` to fix it.', event);
+        $log.warn(LOG_PREFIX, 'Event startsAt should be a javascript date object. Do `new Date(event.startsAt)` to fix it.', event);
       }
 
       if (event.endsAt) {
         if (!angular.isDate(event.endsAt)) {
-          $log.warn('Bootstrap calendar: ', 'Event endsAt should be a javascript date object. Do `new Date(event.endsAt)` to fix it.', event);
+          $log.warn(LOG_PREFIX, 'Event endsAt should be a javascript date object. Do `new Date(event.endsAt)` to fix it.', event);
         }
         if (moment(event.startsAt).isAfter(moment(event.endsAt))) {
-          $log.warn('Bootstrap calendar: ', 'Event cannot start after it finishes', event);
+          $log.warn(LOG_PREFIX, 'Event cannot start after it finishes', event);
         }
       }
 
+      if (event.type && !event.color) {
+        $log.warn(LOG_PREFIX, 'Event type is deprecated, please see the changelog on how to upgrade: ' +
+          'https://github.com/mattlewis92/angular-bootstrap-calendar/blob/master/CHANGELOG.md', event);
+      }
+
       return true;
     }
 
diff --git a/test/unit/directives/mwlCalendar.spec.js b/test/unit/directives/mwlCalendar.spec.js
index 13a2f56d..12d7cbf3 100644
--- a/test/unit/directives/mwlCalendar.spec.js
+++ b/test/unit/directives/mwlCalendar.spec.js
@@ -187,6 +187,20 @@ describe('mwlCalendar directive', function() {
     expect($log.warn).to.have.been.calledOnce;
   });
 
+  it('should log a warning if the deprecated event type is used', function() {
+    $log.warn = sinon.spy();
+    scope.vm.events = [{title: 'title', startsAt: new Date(), type: 'success'}];
+    scope.$apply();
+    expect($log.warn).to.have.been.calledOnce;
+  });
+
+  it('should not log a warning if the deprecated event type is not used', function() {
+    $log.warn = sinon.spy();
+    scope.vm.events = [{title: 'title', startsAt: new Date(), color: {primary: 'blue', secondary: 'lightblue'}}];
+    scope.$apply();
+    expect($log.warn).not.to.have.been.called;
+  });
+
   afterEach(function() {
     clock.restore();
   });