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-rw-r--r--qapi/block-core.json3
1 files changed, 3 insertions, 0 deletions
diff --git a/qapi/block-core.json b/qapi/block-core.json
index 5b9084a394..f20efc97f7 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -3572,6 +3572,9 @@
# @driver: block driver name
# @node-name: the node name of the new node (Since 2.0).
# This option is required on the top level of blockdev-add.
+# Valid node names start with an alphabetic character and may
+# contain only alphanumeric characters, '-', '.' and '_'. Their
+# maximum length is 31 characters.
# @discard: discard-related options (default: ignore)
# @cache: cache-related options
# @read-only: whether the block device should be read-only (default: false).