Add average point on top of histogram

I have a histogram with multiple buckets i.e. revenue, cost, taxes, profit, etc. Within each bucket I have monthly values, so for example I have the revenue bucket and it'll have a bar for january, a bar for february, etc. I want to add like a little circle on top of the bars for each bucket that is the average for that bucket, this way I can see was January revenue higher or lower than the average monthly revenue. I cannot find a way to do this, can you please advise? Thanks!

Well, a column chart to be exact

Figured it out thanks!