Update README.md

README.md

@@ -12,3 +12,10 @@ The dataset contains:
 – parent comment id (on website);  
 – number of responses to the parent comment;  
 – normalized value of number of responses to the parent comment (from 0 to 1).  
+
+Dataset isn't cleaned. It contains these symbols: **a-zA-Zа-яА-Я0-9.,!?;:**  
+Due to the specifics of moderation on DTF.ru the dataset contains many duplicate rows. There are some types of them:  
+– "Этот материал был удален по просьбе автора";  
+– "Комментарий недоступен";  
+– "Комментарий удален автором поста";  
+These are deleted comments, they are valuable only in counting them, but not in learning models or analyzing writing.