diff --git a/CHANGELOG.md b/CHANGELOG.md
index af9c5185..3ccdfb09 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@
 
 #### Fixes
 
+* [#540](https://github.com/ruby-grape/grape-swagger/pull/540): Corrects exposing of array in post body - [@LeFnord](https://github.com/LeFnord).
 * [#509](https://github.com/ruby-grape/grape-swagger/pull/509), [#529](https://github.com/ruby-grape/grape-swagger/pull/529): Making parent-less routes working - [@mur-wtag](https://github.com/mur-wtag).
 * Your contribution here.
 
diff --git a/README.md b/README.md
index b6c9ad46..476380d3 100644
--- a/README.md
+++ b/README.md
@@ -956,7 +956,7 @@ module API
     class Client < Grape::Entity
       expose :name, documentation: { type: 'string', desc: 'Name' }
       expose :addresses, using: Entities::Address,
-        documentation: { type: 'API::Address', desc: 'Addresses.', param_type: 'body', is_array: true }
+        documentation: { type: 'Entities::Address', desc: 'Addresses.', param_type: 'body', is_array: true }
     end
 
     class Address < Grape::Entity
@@ -967,13 +967,15 @@ module API
   class Clients < Grape::API
     version 'v1'
 
-    desc 'Clients index', params: Entities::Client.documentation
+    desc 'Clients index',
+      params: Entities::Client.documentation,
+      success: Entities::Client
     get '/clients' do
       ...
     end
   end
 
-  add_swagger_documentation models: [Entities::Client, Entities::Address]
+  add_swagger_documentation
 end
 ```
 
@@ -988,7 +990,7 @@ module API
     class Client < Grape::Entity
       expose :name, documentation: { type: 'string', desc: 'Name' }
       expose :address, using: Entities::Address,
-        documentation: { type: 'API::Address', desc: 'Addresses.', param_type: 'body', is_array: false }
+        documentation: { type: 'Entities::Address', desc: 'Addresses.', param_type: 'body', is_array: false }
     end
 
     class Address < Grape::Entity
@@ -999,13 +1001,15 @@ module API
   class Clients < Grape::API
     version 'v1'
 
-    desc 'Clients index', params: Entities::Client.documentation
+    desc 'Clients index',
+      params: Entities::Client.documentation,
+      success: Entities::Client
     get '/clients' do
       ...
     end
   end
 
-  add_swagger_documentation models: [Entities::Client, Entities::Address]
+  add_swagger_documentation
 end
 ```
 
diff --git a/lib/grape-swagger/doc_methods/move_params.rb b/lib/grape-swagger/doc_methods/move_params.rb
index 9c7828ac..4d66fecb 100644
--- a/lib/grape-swagger/doc_methods/move_params.rb
+++ b/lib/grape-swagger/doc_methods/move_params.rb
@@ -12,6 +12,8 @@ def to_definition(params, route, definitions)
           @definitions = definitions
           unify!(params)
 
+          return correct_array_param(params) if should_correct_array?(params)
+
           params_to_move = movable_params(params)
           params << parent_definition_of_params(params_to_move, route)
 
@@ -20,6 +22,14 @@ def to_definition(params, route, definitions)
 
         private
 
+        def should_correct_array?(param)
+          param.length == 1 && param.first[:in] == 'body' && param.first[:type] == 'array'
+        end
+
+        def correct_array_param(param)
+          param.first[:schema] = { type: param.first.delete(:type), items: param.first.delete(:items) }
+        end
+
         def parent_definition_of_params(params, route)
           definition_name = GrapeSwagger::DocMethods::OperationId.manipulate(parse_model(route.path))
           referenced_definition = build_definition(definition_name, params, route.request_method.downcase)
diff --git a/lib/grape-swagger/doc_methods/parse_params.rb b/lib/grape-swagger/doc_methods/parse_params.rb
index f5326d99..80119d6c 100644
--- a/lib/grape-swagger/doc_methods/parse_params.rb
+++ b/lib/grape-swagger/doc_methods/parse_params.rb
@@ -68,6 +68,8 @@ def document_array_param(value_type, definitions)
             collection_format = value_type[:documentation][:collectionFormat]
           end
 
+          param_type ||= value_type[:param_type]
+
           array_items = {}
           if definitions[value_type[:data_type]]
             array_items['$ref'] = "#/definitions/#{@parsed_param[:type]}"
diff --git a/spec/issues/539_array_post_body.rb b/spec/issues/539_array_post_body.rb
new file mode 100644
index 00000000..cb8cecbc
--- /dev/null
+++ b/spec/issues/539_array_post_body.rb
@@ -0,0 +1,63 @@
+require 'spec_helper'
+require 'grape-entity'
+require 'grape-swagger-entity'
+
+describe '#427 nested entity given as string' do
+  let(:app) do
+    Class.new(Grape::API) do
+      namespace :issue_427 do
+        class Element < Grape::Entity
+          expose :id
+          expose :description
+          expose :role
+        end
+
+        class ArrayOfElements < Grape::Entity
+          expose :elements,
+                 documentation: {
+                   type: ::Element, is_array: true, param_type: 'body', required: true
+                 }
+        end
+
+        desc 'create account',
+             params: ArrayOfElements.documentation
+        post do
+          present params
+        end
+      end
+
+      add_swagger_documentation format: :json
+    end
+  end
+
+  subject do
+    get '/swagger_doc'
+    JSON.parse(last_response.body)
+  end
+
+  let(:parameters) { subject['paths']['/issue_427']['post']['parameters'] }
+  let(:definitions) { subject['definitions'] }
+
+  specify do
+    expect(parameters).to eql(
+      [
+        {
+          'in' => 'body', 'name' => 'elements', 'required' => true, 'schema' => {
+            'type' => 'array', 'items' => { '$ref' => '#/definitions/Element' }
+          }
+        }
+      ]
+    )
+
+    expect(definitions).to eql(
+      'Element' => {
+        'type' => 'object',
+        'properties' => {
+          'id' => { 'type' => 'string' },
+          'description' => { 'type' => 'string' },
+          'role' => { 'type' => 'string' }
+        }
+      }
+    )
+  end
+end