Reference Dimension

What is the proper way to specify that a dimension is forreference only? Enclose it in parenthesees? For example, when I buya part that needs to be modified in the shop, I usually dimensionthe overall, but I don't want to imply that the dimensions must beprecise. Currently I do this...

1.050 REF

...but I know that's not proper.

Shoult it be (1.050)?

PaulSolidworksDrawings And Detailing