diff --git a/app/core/openapi/schemas.py b/app/core/openapi/schemas.py
new file mode 100644
index 0000000..065470a
--- /dev/null
+++ b/app/core/openapi/schemas.py
@@ -0,0 +1,13 @@
+from drf_spectacular.openapi import AutoSchema
+from drf_spectacular.utils import OpenApiParameter
+
+
+class BackendAutoSchema(AutoSchema):
+    global_params = [
+        OpenApiParameter(
+            name="Accept-Language", location=OpenApiParameter.HEADER, description="`ko` or `en`. Default value is `ko`"
+        )
+    ]
+
+    def get_override_parameters(self) -> list[OpenApiParameter]:
+        return super().get_override_parameters() + self.global_params
diff --git a/app/core/settings.py b/app/core/settings.py
index 739e5d9..f480f40 100644
--- a/app/core/settings.py
+++ b/app/core/settings.py
@@ -169,6 +169,7 @@
     "django.contrib.auth.middleware.AuthenticationMiddleware",
     "django.contrib.messages.middleware.MessageMiddleware",
     "django.middleware.clickjacking.XFrameOptionsMiddleware",
+    "django.middleware.locale.LocaleMiddleware",
     # CORS
     "corsheaders.middleware.CorsMiddleware",
     # simple-history
@@ -312,7 +313,7 @@
 # Django Rest Framework Settings
 REST_FRAMEWORK = {
     "DEFAULT_VERSIONING_CLASS": "rest_framework.versioning.NamespaceVersioning",
-    "DEFAULT_SCHEMA_CLASS": "drf_spectacular.openapi.AutoSchema",
+    "DEFAULT_SCHEMA_CLASS": "core.openapi.schemas.BackendAutoSchema",
     "DEFAULT_RENDERER_CLASSES": ("rest_framework.renderers.JSONRenderer",),
     "EXCEPTION_HANDLER": "drf_standardized_errors.handler.exception_handler",
     "DEFAULT_FILTER_BACKENDS": ("django_filters.rest_framework.DjangoFilterBackend",),