diff --git a/README.rst b/README.rst
index 9604197..634544b 100644
--- a/README.rst
+++ b/README.rst
@@ -89,6 +89,13 @@ forget to apply them again at the end::
     python manage.py unmigrate --fake
     python manage.py migrate --fake
 
+No more master
+--------------
+
+This package (still) uses ``master`` as the name of the default branch. If that
+is no longer the case for your repositories, you can define ``MAIN_BRANCH`` in
+your Django settings.
+
 Do you see potential?
 ---------------------
 
diff --git a/django_unmigrate/core.py b/django_unmigrate/core.py
index d1a6ab1..a2ca2c9 100644
--- a/django_unmigrate/core.py
+++ b/django_unmigrate/core.py
@@ -9,6 +9,8 @@
 from git import Repo
 from git.exc import GitCommandError
 
+from .settings import MAIN_BRANCH
+
 
 class GitError(Exception):
     message = ""
@@ -20,7 +22,7 @@ def __str__(self):
         return self.message
 
 
-def get_targets(database="default", ref="master"):
+def get_targets(database="default", ref=MAIN_BRANCH):
     """
     Produce target migrations from ``database`` and ``ref``.
     """
@@ -28,7 +30,7 @@ def get_targets(database="default", ref="master"):
     return get_parents_from_targets(added_targets, database)
 
 
-def get_added_migrations(ref="master"):
+def get_added_migrations(ref=MAIN_BRANCH):
     """
     Detect the added migrations when compared to ``ref``, and return them as
     target tuples: ``(app_name, migration_name)``
diff --git a/django_unmigrate/management/commands/unmigrate.py b/django_unmigrate/management/commands/unmigrate.py
index caff50f..b3a802b 100644
--- a/django_unmigrate/management/commands/unmigrate.py
+++ b/django_unmigrate/management/commands/unmigrate.py
@@ -4,6 +4,7 @@
 from django.db import DEFAULT_DB_ALIAS
 
 from django_unmigrate.core import get_targets, GitError
+from django_unmigrate.settings import MAIN_BRANCH
 
 
 class Command(BaseCommand):
@@ -11,7 +12,7 @@ class Command(BaseCommand):
 
     def add_arguments(self, parser):
         parser.add_argument(
-            "ref", nargs="?", default="master", help="Git ref to compare existing migrations.",
+            "ref", nargs="?", default=MAIN_BRANCH, help="Git ref to compare existing migrations.",
         )
         parser.add_argument(
             "--database",
diff --git a/django_unmigrate/settings.py b/django_unmigrate/settings.py
new file mode 100644
index 0000000..ab2d35a
--- /dev/null
+++ b/django_unmigrate/settings.py
@@ -0,0 +1,4 @@
+from django.conf import settings
+
+
+MAIN_BRANCH = getattr(settings, "MAIN_BRANCH", "master")