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-rw-r--r--docs/tools/qemu-nbd.rst6
1 files changed, 4 insertions, 2 deletions
diff --git a/docs/tools/qemu-nbd.rst b/docs/tools/qemu-nbd.rst
index e39a9f4b1a..56e54cd441 100644
--- a/docs/tools/qemu-nbd.rst
+++ b/docs/tools/qemu-nbd.rst
@@ -99,8 +99,10 @@ driver options if ``--image-opts`` is specified.
 
 .. option:: --cache=CACHE
 
-  The cache mode to be used with the file.  See the documentation of
-  the emulator's ``-drive cache=...`` option for allowed values.
+  The cache mode to be used with the file. Valid values are:
+  ``none``, ``writeback`` (the default), ``writethrough``,
+  ``directsync`` and ``unsafe``. See the documentation of
+  the emulator's ``-drive cache=...`` option for more info.
 
 .. option:: -n, --nocache