Update 6. Progressive Notification.md

doc/6. Progressive Notification.md

@@ -1,5 +1,5 @@
 # Progressive Notification
-Each utility and effect supports *Progressive Notification*. This is a way to know the progress of the utility of effect- that is, when is it going to complete and how many percents of work are already done.
+Each utility and effect supports *Progressive Notification*. This is a way to track the progress of the utility of effect- that is, when is it going to complete and how many percents of work are already done.
 
 Please note that progressive notification may not always be accurate.