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Just an old leaf, pluck it off and carry on. Looks good.
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No harm and normal leaf fade, remove it and keep going Growmie 
1 Like
Why they said 
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Beautiful job @Hawk49!
I agree the yellowing is probably just normal fade. But the black spots could indicate a slight nutrient deficiency (possibly potassium). Keep an eye on the other leaves to see if they also start showing black spots. If not, you’re fine.
Just to be sure though:
Are you using flowering nutes? And are you checking the pH?
I have been using Fox Farm Big bloom, Grow Big and Tiger bloom, however I think I got nut burn using the colored chart. I did have the signs of nutrient burn so I stopped feeding and gave it a good flush. Should I start using them all again but maybe 1/2 or 1/3 the amount shown on the colored feeding chart?
Plant looks great other than the yellow.
I recommend to continue the same feeding schedule. If you have flowering boosters for added potassium (K) I highly recommend it also. @Hawk49
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