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-rw-r--r--qapi/block-core.json4
1 files changed, 2 insertions, 2 deletions
diff --git a/qapi/block-core.json b/qapi/block-core.json
index 5b0ad1a8b7..f374be4c11 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -1174,7 +1174,7 @@
# @overlay: reference to the existing block device that will become
# the overlay of @node, as part of creating the snapshot.
# It must not have a current backing file (this can be
-# achieved by passing "backing": "" to blockdev-add).
+# achieved by passing "backing": null to blockdev-add).
#
# Since: 2.5
##
@@ -1347,7 +1347,7 @@
# "node-name": "node1534",
# "file": { "driver": "file",
# "filename": "hd1.qcow2" },
-# "backing": "" } }
+# "backing": null } }
#
# <- { "return": {} }
#