diff --git a/setup.py b/setup.py
index 139b476..728ff37 100644
--- a/setup.py
+++ b/setup.py
@@ -67,6 +67,7 @@ setup(name='%s_%s' % (PREFIX, MODULE),
     version=info.get('version', '0.0.1'),
     description='Tryton module to add categories for cashbooks.',
     long_description=long_description,
+    long_description_content_type='text/x-rst',
     url='https://www.m-ds.de/',
     download_url='https://scmdev.m-ds.de/Tryton/Extra/cashbook_bookcategory',
     author='martin-data services',