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-rw-r--r--sparsify/virt-sparsify.pod14
1 files changed, 13 insertions, 1 deletions
diff --git a/sparsify/virt-sparsify.pod b/sparsify/virt-sparsify.pod
index d25f013f..6653787a 100644
--- a/sparsify/virt-sparsify.pod
+++ b/sparsify/virt-sparsify.pod
@@ -126,7 +126,7 @@ eg. C<vmdk>, but support for other formats is reliant on qemu.
Specifying the I<--convert> option is usually a good idea, because
then virt-sparsify doesn't need to try to guess the input format.
-For fine-tuning the output format, see: I<--compress>.
+For fine-tuning the output format, see: I<--compress>, I<-o>.
=item B<--format> raw
@@ -156,6 +156,18 @@ This option is used to make the output more machine friendly
when being parsed by other programs. See
L</MACHINE READABLE OUTPUT> below.
+=item B<-o> option[,option,...]
+
+Pass I<-o> option(s) to the L<qemu-img(1)> command to fine-tune the
+output format. Options available depend on the output format (see
+I<--convert>) and the installed version of the qemu-img program.
+
+You should use I<-o> at most once. To pass multiple options, separate
+them with commas, eg:
+
+ virt-sparsify --convert qcow2 \
+ -o cluster_size=512,preallocation=metadata ...
+
=item B<-q>
=item B<--quiet>