diff --git a/django_migration_linter/migration_linter.py b/django_migration_linter/migration_linter.py
index d278a8a..ff029ee 100644
--- a/django_migration_linter/migration_linter.py
+++ b/django_migration_linter/migration_linter.py
@@ -23,6 +23,7 @@ from subprocess import Popen, PIPE
 from django.conf import settings
 from django.core.management import call_command
 from django.db import DEFAULT_DB_ALIAS, connections, ProgrammingError
+from enum import Enum, unique
 
 from .cache import Cache
 from .constants import DEFAULT_CACHE_PATH
@@ -35,6 +36,17 @@ logger = logging.getLogger(__name__)
 DJANGO_APPS_WITH_MIGRATIONS = ("admin", "auth", "contenttypes", "sessions")
 
 
+@unique
+class MessageType(Enum):
+    OK = "ok"
+    IGNORE = "ignore"
+    ERROR = "error"
+
+    @staticmethod
+    def values():
+        return list(map(lambda c: c.value, MessageType))
+
+
 class MigrationLinter(object):
     def __init__(
         self,