Changing comment in cells based on changes in other cells

[RSprengers]

I have some cells with text (user can change this)
And I have a row with numbers (calculations)

Two related problems:

1. I want to add a comment to each calculation cell that contains data from the text cells (all calculations have different comments, so I have to input this manually) BUT...

2. I want the comments to change if the user changes the text cells

example:

text cell (A1) has text 'abcd' / (a2) has text 'defg'
calculation cell (B1) has comment 'abcd + defg'

Once the user changes a2 to 'hijk', the comment in B1 should change to 'abcd + hijk'

Any solutions?

 

[RSprengers]

I prefer having the actual months, especially if I use > 2 months, it is more clear.

Any solutions?