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+Adding subtitles to Google Drive
+================================
+
+  1. Upload your video to Google Drive
+  2. Right click the video in Google Drive and click Manage caption tracks
+  3. Click Add new captions or transcripts
+  4. Upload a supported subtitle file
+    * I have verified that Google Drive will accept .srt and .vtt subtitles.  It
+      might accept others as well, but I have not tested them.
+
+Once you have uploaded your subtitles, they should be available the next time
+the video is refreshed by CyTube (either restart it or delete the playlist item
+and add it again).  On the video you should see a speech bubble icon in the
+controls, which will pop up a menu of available subtitle tracks.
+
+## Limitations ##
+
+  * Google Drive converts the subtitles you upload into a custom format which
+    loses some information from the original captions.  For example, annotations
+    for who is speaking are not preserved.
+  * As far as I know, Google Drive is not able to automatically detect when
+    subtitle tracks are embedded within the video file.  You must upload the
+    subtitles separately (there are plenty of tools to extract
+    captions/subtitles from MKV and MP4 files).