[libbluray-devel] Add comment

[hpi1]

libbluray | branch: master | hpi1 <hpi1 at anonymous.org> | Thu May 11 14:46:55 2017 +0300| [98fa477d4877a08296f7293175beea2c1930833d] | committer: hpi1

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> http://git.videolan.org/gitweb.cgi/libbluray.git/?a=commit;h=98fa477d4877a08296f7293175beea2c1930833d
---

 src/libbluray/bluray.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/libbluray/bluray.h b/src/libbluray/bluray.h
index e53a9779..349c0a6f 100644
--- a/src/libbluray/bluray.h
+++ b/src/libbluray/bluray.h
@@ -262,7 +262,7 @@ typedef struct bd_mark {
 } BLURAY_TITLE_MARK;
 
 typedef struct bd_title_info {
-    uint32_t             idx;
+    uint32_t             idx;            /* filled only with bd_get_title_info() */
     uint32_t             playlist;
     uint64_t             duration;
     uint32_t             clip_count;