Why does changing a field's verbose name require a migration?

netbox/circuits/migrations/0003_auto_20160621_1728.py

@@ -0,0 +1,25 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.9.7 on 2016-06-21 17:28
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('circuits', '0002_auto_20160620_1929'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='provider',
+            name='admin_contact',
+            field=models.TextField(blank=True, verbose_name=b'Admin contact'),
+        ),
+        migrations.AlterField(
+            model_name='provider',
+            name='noc_contact',
+            field=models.TextField(blank=True, verbose_name=b'NOC contact'),
+        ),
+    ]