Shorten mime-types section in readme

README.md

@@ -171,6 +171,23 @@ contain Russian letters:
 Also make sure that allowing non-latin characters won't cause a compatibility issue with a third-party
 plugins or client-side software.
 
+## Setting the content type
+
+If care about the content type of your files and notice that it's not being set
+as expected, you can configure your uploaders to use `CarrierWave::MimeTypes`.
+This adds a dependency on the [mime-types](http://rubygems.org/gems/mime-types) gem,
+but is recommended when using fog, and fog already has a dependency on mime-types.
+
+``` ruby
+require 'carrierwave/processing/mime_types'
+
+class MyUploader < CarrierWave::Uploader::Base
+  include CarrierWave::MimeTypes
+
+  processor :set_content_type
+end
+```
+
 ## Adding versions
 
 Often you'll want to add different versions of the same file. The classic
@@ -217,48 +234,6 @@ class MyUploader < CarrierWave::Uploader::Base
 end
 ```
 
-## File Content-Types
-
-CarrierWave tries to determine a file's content-type automatically. This is
-done by attempting to call `content_type` on the file, and examining the
-file's extension. If neither approach results in an estimated content-type,
-CarrierWave leaves the file's content-type as `nil`.
-
-In Rails applications, form params usually provide the file's content-type.
-CarrierWave will pick up that content-type automatically, and pass to the
-storage service (Eg: Fog).
-
-### Setting Specific Content-Types
-
-If you're finding that your files' content-type is not being set correctly,
-you can configure your uploaders to use `CarrierWave::MimeTypes`. This will
-examine the file's contents and determine the correct content-type. To do
-this, first require `carrierwave/processing/mime_types`. Eg:
-
-``` ruby
-require 'carrierwave/processing/mime_types'
-```
-
-Next, include `CarrierWave::MimeTypes` in your uploader, and add the 
-_set_content_type_ processor to your uploader. Eg:
-
-``` ruby
-class MyUploader < CarrierWave::Uploader::Base
-  include CarrierWave::MimeTypes
-
-  processor :set_content_type
-end
-```
-
-In Rails applications, the `require` is often put in an initializer.
-
-Note that this adds a dependency on the [mime gem](http://rubygems.org/gems/mime) .
-
-Typically, this should only matter if:
-
-1. You care about the content-type.
-2. You're storing your files in a Fog-backed storage service, such as S3.
-
 ## Making uploads work across form redisplays
 
 Often you'll notice that uploaded files disappear when a validation fails.