diff --git a/lib_xua/doc/pdf/index.pdf b/lib_xua/doc/pdf/index.pdf
index e7896395..8613fe1c 100644
Binary files a/lib_xua/doc/pdf/index.pdf and b/lib_xua/doc/pdf/index.pdf differ
diff --git a/lib_xua/doc/rst/feat.rst b/lib_xua/doc/rst/feat.rst
index 0461ce82..07978c29 100644
--- a/lib_xua/doc/rst/feat.rst
+++ b/lib_xua/doc/rst/feat.rst
@@ -65,12 +65,13 @@ S/PDIF Transmit
 ``lib_xua`` supports the development of devices with S/PDIF transmit functionality through the use of 
 ``lib_spdif``. The XMOS S/PDIF transmitter runs in a single core and supports rates up to 192kHz.
 
-The S/PDIF transmitter core takes PCM audio samples via a channel and outputs them
-in S/PDIF format to a port. The channel should be declared a normal::
+The S/PDIF transmitter core takes PCM audio samples via a channel and outputs them in S/PDIF format to a port.
+Samples are provided to the S/PDIF transmitter task from the ``XUA_AudioHub()`` task.
+
+The channel should be declared a normal::
 
     chan c_spdif_tx
 
-Samples are provided to the S/PDIF transmitter task from the ``XUA_AudioHub()`` task.
 
 In order to use the S/PDIF transmmiter with ``lib_xua`` hardware resources must be declared e.g::
 
@@ -81,7 +82,7 @@ This port should be clocked from the master-clock, ``lib_spdif`` provides a help
     spdif_tx_port_config(p_spdif_tx2, clk_audio_mclk, p_mclk_in, delay);
 
 .. note:: If sharing the master-clock port and clockblock with ``XUA_AudioHub()`` (or any other task) then this setup
-          should be done before running the tasks in a par{}
+          should be done before running the tasks in a ``par`` statement.
 
 Finally the S/PDIF transmitter task must be run - passing in the port and channel for communication with ``XUA_AudioHub``.
 For example::
diff --git a/lib_xua/doc/rst/sw_detail.rst b/lib_xua/doc/rst/sw_detail.rst
index 7be88e2d..fc14996a 100644
--- a/lib_xua/doc/rst/sw_detail.rst
+++ b/lib_xua/doc/rst/sw_detail.rst
@@ -9,6 +9,7 @@ This section will now examine the operation of these components in further detai
 .. toctree::
 
     sw_audio
+    sw_spdif
 
 
 ..  
@@ -16,7 +17,6 @@ This section will now examine the operation of these components in further detai
    sw_ep0
    sw_audio
    sw_mixer
-   sw_spdif
    sw_spdif_rx
    sw_adat
    sw_clocking
diff --git a/lib_xua/doc/rst/sw_spdif.rst b/lib_xua/doc/rst/sw_spdif.rst
index ec60b30a..bcde1034 100755
--- a/lib_xua/doc/rst/sw_spdif.rst
+++ b/lib_xua/doc/rst/sw_spdif.rst
@@ -1,8 +1,8 @@
 S/PDIF Transmit
----------------
+...............
 
-XMOS devices can support S/PDIF transmit up to 192kHz. The XMOS S/SPDIF transmitter component runs
-in a single core and can be found in ``sc_spdif/module_spdif_tx``
+``lib_xua`` supports the development of devices with S/PDIF transmit throught the use of ``lib_spdif``.
+The XMOS S/SPDIF transmitter component runs in a single core and supports sample-rates upto 192kHz.
 
 The S/PDIF transmitter core takes PCM audio samples via a channel and outputs them
 in S/PDIF format to a port.  A lookup table is used to encode the audio data into the required format. 
@@ -24,8 +24,8 @@ clock generation (e.g. when clock source is already locked to desired audio cloc
      - 44.1, 48, 88.2, 96, 176.4, 192 kHz
    * - **Master clock ratios** 
      - 128x, 256x, 512x
-   * - **Module**  
-     - ``module_spdif_tx``
+   * - **Library**  
+     - ``lib_spdif``
 
 Clocking
 ++++++++
@@ -60,6 +60,8 @@ The following protocol is used on the channel:
 
 .. list-table:: S/PDIF Component Protocol
 
+  * - ``outct`` 
+    -  New sample rate command
   * - ``outuint`` 
     - Sample frequency (Hz)
   * - ``outuint`` 
@@ -76,8 +78,6 @@ The following protocol is used on the channel:
     -
   * - ``...``
     -
-  * - ``outct`` 
-    -  Terminate
 
 
 
@@ -138,11 +138,3 @@ indicates sampling frequency as shown in :ref:`usb_audio_spdif_sample_bits`.
   * - 192
     - E
 
-
-
-
-
-
-
-
-