README.md in tracker_api-1.1.0 vs README.md in tracker_api-1.1.1

@@ -82,9 +82,23 @@
 client.project(project_id).stories(fields: ':default,tasks')              # Eagerly get stories with tasks
 client.project.stories(fields: ':default,comments(:default,person)')      # Eagerly get stories with comments and the person that made the comment
 story.comments(fields: ':default,person')                                 # Eagerly get comments and the person that made the comment for a story
 ```
 
+## Warning
+
+Direct mutation of an attribute value skips coercion and dirty tracking. Please use direct assignment or the specialized add_* methods to get expected behavior.
+https://github.com/solnic/virtus#important-note-about-member-coercions
+
+This will cause coercion and dirty tracking to be bypassed and the new label will not be saved.
+```ruby
+story = project.story(847762630)
+
+label = TrackerApi::Resources::Label.new(name: 'Special Snowflake')
+story.labels << label
+story.save
+```
+
 ## TODO
 
 - Add missing resources and endpoints
 - Add create, update, delete for resources