diff --git a/documentation/ref-manual/variables.rst b/documentation/ref-manual/variables.rst
index 5339721f4..025219d54 100644
--- a/documentation/ref-manual/variables.rst
+++ b/documentation/ref-manual/variables.rst
@@ -8205,6 +8205,20 @@ system and gives an overview of their function and contents.
       filesystem image extension found in :term:`DEPLOY_DIR_IMAGE`. For example:
       ``ext4.zst``.
 
+   :term:`QB_FSINFO`
+
+      The :term:`QB_FSINFO` variable provides additional filesystem metadata to
+      ``runqemu`` as a space-separated list of ``fstype:flag`` entries. For
+      example::
+
+         QB_FSINFO = "wic:no-kernel-in-fs tar:rootfs-dbg"
+
+      For WIC images, use ``wic:no-kernel-in-fs`` or ``wic:kernel-in-fs`` to
+      specify whether the kernel is included in the filesystem. For tar-based
+      filesystem types, ``tar:rootfs-dbg`` makes ``runqemu`` use the debug
+      root filesystem image when extracting a tarball for NFS by appending
+      ``-dbg`` to :term:`IMAGE_LINK_NAME`.
+
    :term:`QB_DEFAULT_KERNEL`
 
       When using ``runqemu``, the :term:`QB_DEFAULT_KERNEL` variable controls