diff --git a/src/check_datapackage/__init__.py b/src/check_datapackage/__init__.py
index fd49efcd..6b757a1c 100644
--- a/src/check_datapackage/__init__.py
+++ b/src/check_datapackage/__init__.py
@@ -2,13 +2,13 @@
 
 from .check import check
 from .config import Config
-from .custom_check import CustomCheck, Extensions, RequiredCheck
 from .examples import (
     example_field_properties,
     example_package_properties,
     example_resource_properties,
 )
 from .exclusion import Exclusion
+from .extensions import CustomCheck, Extensions, RequiredCheck
 from .issue import Issue
 from .read_json import read_json
 
diff --git a/src/check_datapackage/check.py b/src/check_datapackage/check.py
index 2a020553..88b32d47 100644
--- a/src/check_datapackage/check.py
+++ b/src/check_datapackage/check.py
@@ -7,8 +7,8 @@
 
 from check_datapackage.config import Config
 from check_datapackage.constants import DATA_PACKAGE_SCHEMA_PATH, GROUP_ERRORS
-from check_datapackage.custom_check import apply_extensions
 from check_datapackage.exclusion import exclude
+from check_datapackage.extensions import apply_extensions
 from check_datapackage.internals import (
     _filter,
     _flat_map,
diff --git a/src/check_datapackage/config.py b/src/check_datapackage/config.py
index 750707e6..fd7e1aef 100644
--- a/src/check_datapackage/config.py
+++ b/src/check_datapackage/config.py
@@ -1,8 +1,8 @@
 from dataclasses import dataclass, field
 from typing import Literal
 
-from check_datapackage.custom_check import Extensions
 from check_datapackage.exclusion import Exclusion
+from check_datapackage.extensions import Extensions
 
 
 @dataclass
diff --git a/src/check_datapackage/custom_check.py b/src/check_datapackage/extensions.py
similarity index 100%
rename from src/check_datapackage/custom_check.py
rename to src/check_datapackage/extensions.py
diff --git a/tests/test_check.py b/tests/test_check.py
index b4add079..6c105532 100644
--- a/tests/test_check.py
+++ b/tests/test_check.py
@@ -4,13 +4,13 @@
 
 from check_datapackage.check import check
 from check_datapackage.config import Config
-from check_datapackage.custom_check import Extensions
 from check_datapackage.examples import (
     example_package_properties,
     example_resource_properties,
 )
 from check_datapackage.exclusion import Exclusion
-from tests.test_custom_check import lowercase_check
+from check_datapackage.extensions import Extensions
+from tests.test_extensions import lowercase_check
 
 # "MUST" checks
 
diff --git a/tests/test_custom_check.py b/tests/test_extensions.py
similarity index 98%
rename from tests/test_custom_check.py
rename to tests/test_extensions.py
index 1a5ae798..0228b659 100644
--- a/tests/test_custom_check.py
+++ b/tests/test_extensions.py
@@ -1,10 +1,10 @@
 from check_datapackage.check import check
 from check_datapackage.config import Config
-from check_datapackage.custom_check import CustomCheck, Extensions, RequiredCheck
 from check_datapackage.examples import (
     example_package_properties,
     example_resource_properties,
 )
+from check_datapackage.extensions import CustomCheck, Extensions, RequiredCheck
 from check_datapackage.issue import Issue
 
 lowercase_check = CustomCheck(