Drop down list that can be expanded with new entries

[dpaton05]

I need a drop down list of organisations for a cell. I have set it to allow list in the data validation settings but I am not sure of the code to go in the source box. The list is currently on a sheet called CSCs and is a table called tblOrganisation. If you need the table limits, it goes from E18 - E109 with the header in row 17. I know how to do it if it is just the list but new entries might need to be added at a later date. There is nothing below the table in that column.

Could someone help me with the code to enter in the source box please?

 

[dpaton05]

I found out what to do.