Update README.md

README.md

@@ -168,7 +168,10 @@ print (model_output.metadata.unified_scores)
 
 Our model is intented to be used for **MT evaluation**. 
 
-Given a a triplet with (source sentence, translation, reference translation) outputs a single score between 0 and 1 where 1 represents a perfect translation. 
+Given a a triplet with (source sentence, translation, reference translation) outputs three scores that reflect the translation quality according to different inputs: 
+- source score: [`mt`, `src`]
+- reference score: [`mt`, `ref`]
+- unified score: [`mt`, `src`, `ref`]
 
 # Languages Covered: