Updated release note.

Author: Jinho Choi

doc/release-notes.md

@@ -2,5 +2,5 @@
 
 ## Version 1.0 (May, 2017)
 
-* Each utterance is annotated with one of the seven emotion, , *sad*, *mad*, *scared*, *powerful*, *peaceful*, *joyful*, and *neutral*.
+* Each utterance is annotated with one of the seven emotion, *sad*, *mad*, *scared*, *powerful*, *peaceful*, *joyful*, and *neutral*, in the Feeling Wheel proposed by Willcox, 1982.
 * See our [AFFCON'17](https://arxiv.org/abs/1708.04299) paper for more details.