Update README.md

README.md

@@ -14,4 +14,5 @@ The dataset is from [Deep mutational scans of XBB.1.5 and BQ.1.1 reveal ongoing
 
 
 ### Label
-Label means delta mutation effect (ACE2 binding affinities) compre to wildtype.
+Label means delta mutation effect (ACE2 binding affinities) compre to wildtype, ranging from minus infinity to positive infinity.
+Zero means no affinity, lager means higher affinity and smaller means lower affinity.