Annotations needed when using Retrofit if attribute names are uppercase

OK, this might not be technically incorrect, but it's confusing at least for me.
[Consuming APIs with Retrofit](https://guides.codepath.com/android/Consuming-APIs-with-Retrofit)
> You can select the Annotation style to Gson, but it's not entirely necessary since the Java file created will work without it.

I've just tried using OMDB API (example:
http://www.omdbapi.com/?i=tt0816692&plot=short&r=json
) and spent some time wondering why most of the values in my object are null, until I realized the problem is most of the attribute names are uppercase, while the variable names are lowercase. With Gson annotations like:

`@SerializedName("Title")`
`@Expose`
`private String title;`

the problem went away.