diff --git a/stack.sh b/stack.sh
index 9982c35..5064d5d 100755
--- a/stack.sh
+++ b/stack.sh
@@ -695,14 +695,11 @@
 # Database Configuration
 # ----------------------
 
-# To select between database backends, add the following to ``local.conf``:
+# DevStack provides a MySQL database backend. Additional backends may be
+# provided by external plugins and can be enabled using the usual service
+# functions and ``ENABLED_SERVICES``. For example, to disable MySQL:
 #
 #    disable_service mysql
-#    enable_service postgresql
-#
-# The available database backends are listed in ``DATABASE_BACKENDS`` after
-# ``lib/database`` is sourced. ``mysql`` is the default.
-
 if initialize_database_backends; then
     echo "Using $DATABASE_TYPE database backend"
     # Last chance for the database password. This must be handled here