Tag a special episode in between a season

Hey guys,

I don’t get a special episode tagged, which is in between a season. i hope you can explain me how to name those.

The episodes I want to tag:
http://thetvdb.com/?tab=season&seriesid=…893&lid=14

I tried different things. S01ESpecial (did not worked), S00E01 (thats wrong, its not listed directly as special, its listen in the season as special)

I hope you can help me fixing this small problem Frown