[PATCH 3/3] parse-headers.rst: add an introduction to the man page

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The pod2rst tool generated a man page for parse-headers.pl
script, but it is better to put it into some context.

Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxxx>
---
 Documentation/doc-guide/parse-headers.rst | 26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

diff --git a/Documentation/doc-guide/parse-headers.rst b/Documentation/doc-guide/parse-headers.rst
index a1867d757ff4..615e25ec64bb 100644
--- a/Documentation/doc-guide/parse-headers.rst
+++ b/Documentation/doc-guide/parse-headers.rst
@@ -1,6 +1,28 @@
-================
+===========================
+Including uAPI header files
+===========================
+
+Sometimes, it is useful to include header files and C example codes in
+order to describe the userspace API and to generate cross-references
+between the code and the documentation. Adding cross-references for
+userspace API files has an additional vantage: Sphinx will generate warnings
+if a symbol is not found at the documentation. That helps to keep the
+uAPI documentation in sync with the Kernel changes.
+The :ref:`parse_headers.pl <parse_headers>` provide a way to generate such
+cross-references. It has to be called via Makefile, while building the
+documentation. Please see ``Documentation/media/Makefile`` for an example
+about how to use it inside the Kernel tree.
+
+.. _parse_headers:
+
 parse_headers.pl
-================
+^^^^^^^^^^^^^^^^
+
+.. NOTE: the man pages below were generated using pod2rst tool:
+.. http://search.cpan.org/~dowens/Pod-POM-View-Restructured-0.02/bin/pod2rst
+.. If you need to change anything below this point, please do the changes
+.. at parse-headers.pl directly, re-run the script and paste the output of
+.. the script here.
 
 ****
 NAME
-- 
2.7.4


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