--- a/src/pyams_content/component/paragraph/header.py	Wed Dec 12 11:12:59 2018 +0100
+++ b/src/pyams_content/component/paragraph/header.py	Wed Dec 12 11:14:55 2018 +0100
@@ -12,29 +12,22 @@
 
 __docformat__ = 'restructuredtext'
 
-
-# import standard library
+from zope.schema.fieldproperty import FieldProperty
 
-# import interfaces
-from pyams_content.component.paragraph.interfaces.header import IHeaderParagraph, HEADER_PARAGRAPH_RENDERERS, \
-    HEADER_PARAGRAPH_NAME
-from pyams_content.features.checker.interfaces import IContentChecker, ERROR_VALUE
+from pyams_content.component.paragraph import BaseParagraph, BaseParagraphContentChecker
+from pyams_content.component.paragraph.interfaces.header import HEADER_PARAGRAPH_NAME, HEADER_PARAGRAPH_RENDERERS, \
+    IHeaderParagraph
+from pyams_content.features.checker.interfaces import ERROR_VALUE, IContentChecker
+from pyams_content.features.renderer import RenderersVocabulary
 from pyams_i18n.interfaces import II18n
-
-# import packages
-from pyams_content.component.paragraph import BaseParagraph, BaseParagraphContentChecker
-from pyams_content.features.renderer import RenderersVocabulary
 from pyams_utils.adapter import adapter_config
 from pyams_utils.factory import factory_config
 from pyams_utils.text import get_text_start
 from pyams_utils.vocabulary import vocabulary_config
-from zope.interface import implementer
-from zope.schema.fieldproperty import FieldProperty
 
 from pyams_content import _
 
 
-@implementer(IHeaderParagraph)
 @factory_config(provided=IHeaderParagraph)
 class HeaderParagraph(BaseParagraph):
     """Header paragraph"""