1 files changed, 2 insertions, 0 deletions
diff --git a/mp_core.h b/mp_core.h
index 49cc81a8e1..153869d620 100644
--- a/mp_core.h
+++ b/mp_core.h
@@ -104,6 +104,8 @@ typedef struct MPContext {
     struct timeline_part *timeline;
     int num_timeline_parts;
     int timeline_part;
+    // NOTE: even if num_chapters==0, chapters being not NULL signifies presence
+    //       of chapter metadata
     struct chapter *chapters;
     int num_chapters;
     double video_offset;