diff --git a/data/org.freedesktop.portal.Flatpak.xml b/data/org.freedesktop.portal.Flatpak.xml
index e1860152..731eaabb 100644
--- a/data/org.freedesktop.portal.Flatpak.xml
+++ b/data/org.freedesktop.portal.Flatpak.xml
@@ -137,6 +137,66 @@
the instance directory (i.e. ~/.var/app/$APP_ID/sandbox).
+
+ sandbox-expose-fd ah
+
+ A list of file descriptor for files inside the sandbox that will be exposed
+ to the new sandbox, for reading and writing (if the caller has write access).
+ The file descriptors must be opened with O_PATH and O_NOFOLLOW and cannot be symlinks.
+
+ This was added in version 3 of this interface (available from flatpak 1.6.0 and later).
+
+
+
+ sandbox-expose-fd-ro ah
+
+ A list of file descriptor for files inside the sandbox that will be exposed
+ to the new sandbox, readonly. The file descriptors must be opened with O_PATH and O_NOFOLLOW and cannot be symlinks.
+
+ This was added in version 3 of this interface (available from flatpak 1.6.0 and later).
+
+
+
+ sandbox-flags u
+
+ Flags affecting the created sandbox. The following flags values are supported:
+
+
+ 1
+
+ Share the display access (X11, wayland) with the caller.
+
+
+
+ 2
+
+ Share the sound access (pulseaudio) with the caller.
+
+
+
+ 4
+
+ Share the gpu access with the caller.
+
+
+
+ 8
+
+ Allow sandbox access to (filtered) session bus.
+
+
+
+ 16
+
+ Allow sandbox access to accessibility bus.
+
+
+
+
+
+ This was added in version 3 of this interface (available from flatpak 1.6.0 and later).
+
+
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