First I have no clue what "add on" means when looking at funding a CD. Now I assume that once a CD is opened additional funds may be added to the initial opening amount at a later date up to the maximum allowed. Having just opened a Synchrony 15 mo. special 2k opening required, I checked the D/A info for Synchrony and it shows a yes in add on. Thinking that I could deposit more each month to the CD, I checked Synchrony web page and it says no. Am I reading this wrong or confusing the whatevers in this? Can someone in the know cipher this for me. Thanks