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-rw-r--r--sphinx/application.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/sphinx/application.py b/sphinx/application.py
index 516b7be58..afcdc02ed 100644
--- a/sphinx/application.py
+++ b/sphinx/application.py
@@ -23,7 +23,6 @@ from docutils.parsers.rst import Directive, roles
import sphinx
from sphinx import package_dir, locale
from sphinx.config import Config
-from sphinx.config import CONFIG_FILENAME # NOQA # for compatibility (RemovedInSphinx30)
from sphinx.deprecation import RemovedInSphinx40Warning
from sphinx.environment import BuildEnvironment
from sphinx.errors import ApplicationError, ConfigError, VersionRequirementError
@@ -73,6 +72,7 @@ builtin_extensions = (
'sphinx.config',
'sphinx.domains.c',
'sphinx.domains.changeset',
+ 'sphinx.domains.citation',
'sphinx.domains.cpp',
'sphinx.domains.javascript',
'sphinx.domains.math',