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-rw-r--r--src/vertical_reference.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/vertical_reference.h b/src/vertical_reference.h
index 8f5d899..1ac921b 100644
--- a/src/vertical_reference.h
+++ b/src/vertical_reference.h
@@ -29,6 +29,9 @@ enum VerticalReference
TOP_OF_SCREEN,
CENTRE_OF_SCREEN,
BOTTOM_OF_SCREEN,
+ /** position on screen is not known, so we are referring
+ * to the top of the subtitle.
+ */
TOP_OF_SUBTITLE
};