diff --git a/doc/source/configuration/reference/bifrost.rst b/doc/source/configuration/reference/bifrost.rst
index a8d1d7ccc..21307eac5 100644
--- a/doc/source/configuration/reference/bifrost.rst
+++ b/doc/source/configuration/reference/bifrost.rst
@@ -80,8 +80,7 @@ configuration drive built by Bifrost, rather than the Bifrost default of
     releases.*
 
     DIB default environment variables. Default is
-    ``{"DIB_CLOUD_INIT_DATASOURCES": "ConfigDrive",
-    "DIB_DISABLE_KERNEL_CLEANUP": 1}``.
+    ``{"DIB_CLOUD_INIT_DATASOURCES": "ConfigDrive"}``.
 ``kolla_bifrost_dib_env_vars_extra``
     *Added in the Train release. Use kolla_bifrost_dib_env_vars in earlier
     releases.*
diff --git a/etc/kayobe/bifrost.yml b/etc/kayobe/bifrost.yml
index 91c8bcc56..34f84ef32 100644
--- a/etc/kayobe/bifrost.yml
+++ b/etc/kayobe/bifrost.yml
@@ -40,7 +40,7 @@
 #kolla_bifrost_dib_init_element:
 
 # DIB default environment variables. Default is {"DIB_CLOUD_INIT_DATASOURCES":
-# "ConfigDrive", "DIB_DISABLE_KERNEL_CLEANUP": 1}.
+# "ConfigDrive"}.
 #kolla_bifrost_dib_env_vars_default:
 
 # DIB additional environment variables. Default is none.