diff --git a/testtools/content_type.py b/testtools/content_type.py
index aca4ef6..a936506 100644
--- a/testtools/content_type.py
+++ b/testtools/content_type.py
@@ -30,4 +30,4 @@ class ContentType(object):
         return "%s/%s params=%s" % (self.type, self.subtype, self.parameters)
 
 
-PLAIN_TEXT = ContentType('text', 'plain', {'charset': 'utf8'})
+UTF8_TEXT = ContentType('text', 'plain', {'charset': 'utf8'})
diff --git a/testtools/tests/test_content_type.py b/testtools/tests/test_content_type.py
index 8a020ab..d593a14 100644
--- a/testtools/tests/test_content_type.py
+++ b/testtools/tests/test_content_type.py
@@ -2,7 +2,7 @@
 
 from testtools import TestCase
 from testtools.matchers import Equals
-from testtools.content_type import ContentType, PLAIN_TEXT
+from testtools.content_type import ContentType, UTF8_TEXT
 
 
 class TestContentType(TestCase):
@@ -33,10 +33,10 @@ class TestContentType(TestCase):
 class TestBuiltinContentTypes(TestCase):
 
     def test_plain_text(self):
-        # The PLAIN_TEXT content type represents UTF-8 encoded text/plain.
-        self.assertThat(PLAIN_TEXT.type, Equals('text'))
-        self.assertThat(PLAIN_TEXT.subtype, Equals('plain'))
-        self.assertThat(PLAIN_TEXT.parameters, Equals({'charset': 'utf8'}))
+        # The UTF8_TEXT content type represents UTF-8 encoded text/plain.
+        self.assertThat(UTF8_TEXT.type, Equals('text'))
+        self.assertThat(UTF8_TEXT.subtype, Equals('plain'))
+        self.assertThat(UTF8_TEXT.parameters, Equals({'charset': 'utf8'}))
 
 
 def test_suite():