F 70-210 question

[Boris Liberman]

Hi!

Thanks to Marnie I got this lens. This is one nicely done piece of 
optic. You know, my 2 years old Sigma zoom suffers from zoom creep 
while this one is going strong!

Anyway, I have a question - there is a green marking just beside the 
little point that denotes the set aperture on the aperture ring. What 
does it mean this green mark?

Thanks in advance and special thanks to Marnie who enabled me with 
this fine optic!

Now I can surely sell my Soligor 70-222/3.5 lens... Any takers? <grin>

Boris