Text box dispalyed after grid field is edited

Hello, 

I have an interface with a grid which has a column called actual time which is an editable field and multiple entries can be added. Suppose i enter 3 rows and there are 3 values for actual time say 5, 10,15 and if i edit the first value ie 5, a text box should be displayed where a comment can be added. 

So if any of the row values is edited, the text box is displayed. 

TIA!!

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