[FFmpeg-cvslog] doxygen: Add a note on libavutil's modular nature

[Timothy Gu]

ffmpeg | branch: master | Timothy Gu <timothygu99 at gmail.com> | Fri Jul 29 17:18:09 2016 -0700| [22df70e9edaa8353e5edcc65c660d2d9f19ede5a] | committer: Timothy Gu

doxygen: Add a note on libavutil's modular nature

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=22df70e9edaa8353e5edcc65c660d2d9f19ede5a
---

 libavutil/avutil.h | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/libavutil/avutil.h b/libavutil/avutil.h
index c1f76c1..27e9cf0 100644
--- a/libavutil/avutil.h
+++ b/libavutil/avutil.h
@@ -23,7 +23,8 @@
 
 /**
  * @file
- * external API header
+ * @ingroup lavu
+ * Convenience header that includes @ref lavu "libavutil"'s core.
  */
 
 /**
@@ -81,11 +82,14 @@
  * @defgroup lavu Common utility functions
  *
  * @brief
- * libavutil contains the code shared across all the other FFmpeg
- * libraries
- *
- * @note In order to use the functions provided by avutil you must include
- * the specific header.
+ * libavutil contains the code shared across all the other FFmpeg libraries.
+ *
+ * @note
+ * libavutil is designed to be modular. In most cases, in order to use the
+ * functions provided by one component of libavutil you must explicitly include
+ * the specific header containing that feature. If you are only using
+ * media-related components, you could simply include libavutil/avutil.h, which
+ * brings in most of the "core" components.
  *
  * @{
  *