-/** Add the to time for the last subtitle added from a piece.
- * @param piece Piece that the subtitle is from.
- * @param to To time for the last subtitle submitted to add_from for this piece.
+/** Add the to time for the last subtitle added from a piece of content.
+ * @param content Content that the subtitle is from.
+ * @param to To time for the last subtitle submitted to add_from for this content.