This document discusses how to add subtitles to videos. For subtitled video on the internet or DVD, only one file is needed. For unsubtitled video, two files are required - the original video file and a separate subtitle file. It then lists some media players and subtitle editors that can be used to open these files and view videos with subtitles, including VLC Media Player, Media Player Classic, Subtitle Editor for Linux, and Aegisub. Finally, it provides some website addresses where subtitles can be downloaded.