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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).