Update README.md

README.md

@@ -438,7 +438,8 @@ The dataset is annotated with 15 entity types:
 Relations capture the interactions between entities and are categorized into 13 types:
 - AFFECTS, IMPROVES, WORSENS, ASSOCIATED_WITH, POS_ASSOCIATED_WITH, NEG_ASSOCIATED_WITH, INTERACTS_WITH, INCREASES, DECREASES, CAUSES, PREVENTS, PREDISPOSES, HAS_COMPONENT
 
-Annotations also include relation triggers (the specific word or phrase indicating the relation, e.g., "increased") and factuality levels (Factual, Negated, Uncertain).
+Annotations also include relation triggers (the specific word or phrase indicating the relation, e.g., "increased") and factuality levels (Factual, Probable, Possible, Doubtful, Negated, and
+Unknown).