diff --git a/README.rst b/README.rst
index 20dcb9b..a05150f 100644
--- a/README.rst
+++ b/README.rst
@@ -6,10 +6,10 @@
 Django Hashid Field
 ====================
 
-> [!CAUTION]
-> This library has been retired. It is no longer recommended for new projects. Existing projects do not require
-> changes, but should consider migrating to a different library. See the [RETIRED](RETIRED.md) document for more
-> information.
+.. caution::
+    This library has been retired. It is no longer recommended for new projects. Existing projects do not require
+    changes, but should consider migrating to a different library. See the [RETIRED](RETIRED.md) document for more
+    information.
 
 A custom Model Field that uses the `Hashids <http://hashids.org/>`_ `library <https://pypi.python.org/pypi/hashids/>`_
 to obfuscate an IntegerField or AutoField. It can be used in new models or dropped in place of an existing IntegerField,