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-rw-r--r--docs/tools/virtiofsd.rst4
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diff --git a/docs/tools/virtiofsd.rst b/docs/tools/virtiofsd.rst
index 866b7db3ee..00554c75bd 100644
--- a/docs/tools/virtiofsd.rst
+++ b/docs/tools/virtiofsd.rst
@@ -228,6 +228,10 @@ The 'map' type adds a number of separate rules to add **prepend** as a prefix
to the matched **key** (or all attributes if **key** is empty).
There may be at most one 'map' rule and it must be the last rule in the set.
+Note: When the 'security.capability' xattr is remapped, the daemon has to do
+extra work to remove it during many operations, which the host kernel normally
+does itself.
+
xattr-mapping Examples
----------------------