1 files changed, 6 insertions, 0 deletions

diff --git a/documentation/migration-guides/migration-5.1.rst b/documentation/migration-guides/migration-5.1.rst
index 18b445c6b5..d3c28f8b34 100644
--- a/documentation/migration-guides/migration-5.1.rst
+++ b/documentation/migration-guides/migration-5.1.rst
@@ -148,6 +148,12 @@ The following variables have been removed:
    enabled. Users can disable the volatile log by removing the value
    ``files/fs-perms-volatile-log.txt`` from :term:`FILESYSTEM_PERMS_TABLES`.
 
+-  ``VOLATILE_TMP_DIR``: :term:`FILESYSTEM_PERMS_TABLES` is now used instead.
+   By default, :term:`FILESYSTEM_PERMS_TABLES` now contains the value
+   ``files/fs-perms-volatile-tmp.txt``, which means that volatile tmp is
+   enabled. Users can disable the volatile tmp by removing the value
+   ``files/fs-perms-volatile-tmp.txt`` from :term:`FILESYSTEM_PERMS_TABLES`.
+
 .. _migration-5.1-removed-recipes:
 
 Removed recipes