Update README.md

README.md

@@ -16,7 +16,7 @@ task_ids:
 - named-entity-recognition
 
 ---
-The dataset contains 5462 training samples, 711 validation samples and 725 test samples. 
+The dataset contains 5462 training samples (tweets), 711 validation samples and 725 test samples. 
 Each sample represents a sentence and includes the following features: sentence ID ('sent\_id'), 
 list of tokens ('tokens'), list of normalised tokens ('norms'), list of lemmas ('lemmas'), list of UPOS tags ('upos\_tags'), 
 list of Multext-East tags ('xpos\_tags), list of morphological features ('feats'),