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diff --git a/Documentation/media/uapi/dvb/ca-set-descr.rst b/Documentation/media/uapi/dvb/ca-set-descr.rst
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+.. -*- coding: utf-8; mode: rst -*-
+
+.. _CA_SET_DESCR:
+
+============
+CA_SET_DESCR
+============
+
+Name
+----
+
+CA_SET_DESCR
+
+
+Synopsis
+--------
+
+.. cpp:function:: int  ioctl(fd, int request = CA_SET_DESCR, ca_descr_t *)
+
+
+Arguments
+---------
+
+.. flat-table::
+    :header-rows:  0
+    :stub-columns: 0
+
+
+    -  .. row 1
+
+       -  int fd
+
+       -  File descriptor returned by a previous call to open().
+
+    -  .. row 2
+
+       -  int request
+
+       -  Equals CA_SET_DESCR for this command.
+
+    -  .. row 3
+
+       -  ca_descr_t \*
+
+       -  Undocumented.
+
+
+Description
+-----------
+
+This ioctl is undocumented. Documentation is welcome.
+
+
+Return Value
+------------
+
+On success 0 is returned, on error -1 and the ``errno`` variable is set
+appropriately. The generic error codes are described at the
+:ref:`Generic Error Codes <gen-errors>` chapter.