I have a client who is about to go and add the same line

hi.

I have a client who is about to go and add the same line of text to all of the descriptions on their products.

Is there a good way I could use a plugin or include to make the line of text be some kind of include that would allow me to change the text in just one place if things change later on?

Does that make sense? I'm just trying to make it easy for her so she doesn't have to go reedit like 200 pages later on.

thanks,