What does the number after the dot in a PFAM accession mean?

Question

[genomeandahalf]

Often times you see PFAMs listed like: PF05183.6 PF07705.5

What do the '6' and '5' after the periods mean in this context?

[GenoMax]

Generally those .x numbers indicate versions of that accession number (with a higher number indicating a newer version).