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-rw-r--r--qmp-commands.hx3
1 files changed, 2 insertions, 1 deletions
diff --git a/qmp-commands.hx b/qmp-commands.hx
index c5e6cd57aa..956f1b0f47 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -1689,7 +1689,8 @@ Arguments:
- "job-id": Identifier for the newly-created block job. If omitted,
the device name will be used. (json-string, optional)
-- "device": device name to operate on (json-string)
+- "device": the device name or node-name of a root node whose writes should be
+ mirrored. (json-string)
- "target": name of new image file (json-string)
- "format": format of new image (json-string, optional)
- "node-name": the name of the new block driver state in the node graph