Kathy wrote:
Comments are not like this...:

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mov a,#10h ;moves 10 hex to a 

But ... like this:

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mov a,#10h ;loads accumulator with value 10 hex 

But Kathy, the 2nd example is just a more long-winded way of writing exactly the same as the first; it simply describes the action of the MOV instruction - which can be found from the databook.
As you say, the comment should describe why the instruction is there, not just what it does; eg, what is the significance of the "magic number" #10h?