diff --git a/lib/active_model/serializer.rb b/lib/active_model/serializer.rb
index e7f74ced..5d6868c4 100644
--- a/lib/active_model/serializer.rb
+++ b/lib/active_model/serializer.rb
@@ -20,6 +20,15 @@ module ActiveModel
       def embed(type, options={})
         SETTINGS[:embed] = type
         SETTINGS[:include] = true if options[:include]
+        warn <<-WARN
+** Notice: embed is deprecated. **
+The use of .embed method on a Serializer will be soon removed, as this should have a global scope and not a class scope.
+Please use the global .setup method instead:
+ActiveModel::Serializer.setup do |config|
+  config.embed = :#{type}
+  config.include = #{SETTINGS[:include] || false}
+end
+        WARN
       end
 
       if RUBY_VERSION >= '2.0'