Update README.md

README.md

@@ -11,7 +11,8 @@ document: Home Alone is a 1990 American Christmas comedy film written and produc
 span: 121:270
 ```
 
-The spans indicate on character level, which sentences in the document are relevant to the claim, and are derived from the sentence level annotations of the original FEVER dataset.
+The spans indicate on character level, which sentences in the document are relevant to the claim, and are derived from the sentence level annotations of the original FEVER dataset. 
+This test set only includes claim and document pairs that are labelled as SUPPORTS and have a sentence number annotated that is not -1.
 It can be loaded as follows:
 
 ```