---
 libavformat/avio.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavformat/avio.h b/libavformat/avio.h
index 86f754e..b9b4017 100644
--- a/libavformat/avio.h
+++ b/libavformat/avio.h
@@ -186,6 +186,9 @@ int avio_check(const char *url, int flags);
  *
  * @param buffer Memory block for input/output operations via AVIOContext.
  *        The buffer must be allocated with av_malloc() and friends.
+ *        It may be freed and replaced with a new buffer by libavformat.
+ *        AVIOContext.buffer holds the buffer currently in use,
+ *        which must be later freed with av_free().
  * @param buffer_size The buffer size is very important for performance.
  *        For protocols with fixed blocksize it should be set to this 
blocksize.
  *        For others a typical size is a cache page, e.g. 4kb.
-- 
2.1.3
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