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-rw-r--r--qemu-doc.texi6
1 files changed, 5 insertions, 1 deletions
diff --git a/qemu-doc.texi b/qemu-doc.texi
index ad418f8..aabe8df 100644
--- a/qemu-doc.texi
+++ b/qemu-doc.texi
@@ -698,7 +698,11 @@ Supported options:
Specifies which VHDX subformat to use. Valid options are
@code{dynamic} (default) and @code{fixed}.
@item block_state_zero
-Force use of payload blocks of type 'ZERO'.
+Force use of payload blocks of type 'ZERO'. Can be set to @code{on} (default)
+or @code{off}. When set to @code{off}, new blocks will be created as
+@code{PAYLOAD_BLOCK_NOT_PRESENT}, which means parsers are free to return
+arbitrary data for those blocks. Do not set to @code{off} when using
+@code{qemu-img convert} with @code{subformat=dynamic}.
@item block_size
Block size; min 1 MB, max 256 MB. 0 means auto-calculate based on image size.
@item log_size
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