Removing comments if Cell value changes to Blank

Hi all, No doubt this has been asked many times before but it's my first post and I'm very new with Marcos so please be kind
I have Main worksheet (sheet 9) and some codes in Sheet 10 which I use as a source for data validation in Sheet 9. So far I have a macro which looks for changes in cells and, when someone chooses a code from the list the macro adds a comment to the cell and populates it with an explanation of the code. The explanations are also in the code worksheet (Sheet 10). It works really nicely but I cannot work out how to remove the comment if the user clears the value in the cell.
Can anyone help??

My Macro thus far is:

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