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-rw-r--r--qapi/block-core.json7
1 files changed, 5 insertions, 2 deletions
diff --git a/qapi/block-core.json b/qapi/block-core.json
index ab96e34..76bf50f 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -3134,8 +3134,11 @@
# This option is required on the top level of blockdev-add.
# @discard: discard-related options (default: ignore)
# @cache: cache-related options
-# @read-only: whether the block device should be read-only
-# (default: false)
+# @read-only: whether the block device should be read-only (default: false).
+# Note that some block drivers support only read-only access,
+# either generally or in certain configurations. In this case,
+# the default value does not work and the option must be
+# specified explicitly.
# @detect-zeroes: detect and optimize zero writes (Since 2.1)
# (default: off)
# @force-share: force share all permission on added nodes.