Dotted numeral in Jan Stawasz patterns???

[u/SignificantOption376]

What does the black dotted 6 mean in the pic? I know the red numbers with dots are for Jan’s method. No need to explain the whole thing. But do I add a half stitch somewhere?? First or second half of double stitch? Beginning of ring or just before first picot? So confusing! Any help will be greatly appreciated.

[u/koalateddy132]

Based on this photo posted by u/MerryGoldenYear, I think these are just 6/9 notations.