Update README.md

README.md

@@ -43,10 +43,10 @@ Test: 10,000
 - program (string): the program this transcript came from
 - date (string): date of program
 - url (string): link to where audio and transcript are located
-- title (string): title of the program
+- title (string): title of the program. some datapoints do not have a title
 - summary (string): summary of the program
-- utt (list): list of utterances by the speakers in the program. corresponds with `speaker`
-- speaker (list): list of speakers, corresponds with `utt`
+- utt (list of string): list of utterances by the speakers in the program. corresponds with `speaker`
+- speaker (list of string): list of speakers, corresponds with `utt`
 
 
 Example: