#3 Documentation question

On page 16 of "Understanding WS-CDL.pdf" it says:

"Once we have some roles defined we can define the
relationships. In WS-CDL a relationship declares an
intention to interact between two roles. In a sequence
diagram this is akin to any two of the actors (check
the name here) who have a connecting arrow in any
direction.
So in our example we have relationships between the..."

What does this mean: "(check the name here)"?

I did not understand this phrase. Please help explain.

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The "(check the name here)" is a comment back to me to check if the term
"actor" is the correct name for the sequence diagrams. I din't manage to sort
this out when we published it. In some publications they are called "objects"
and the lines "method calls". But I wanted to stay somewhat more generic
because an object may not mean the same as a service to most people.