"Wingers are meant to score," Van Der Merwe told The Scotsman. "We're the guys who should finish things off.
"Thom is good friend of mine and it would be great to give him the text when I do score and beat him.
"He texted me when I got to 26 and he saw I was getting close. Obviously he is keeping tabs on that."
Glasgow's ability to cross the whitewash has seen them fly up the RaboDirect PRO12 table of late - the Scotstoun outfit grabbing 47 in total, one fewer than Leinster at the top of the charts this year.
Van Der Merwe has not been among them of late however, his last coming in late 2012 against Edinburgh, but he's praised the contribution of teammate Tim Swinson who has stepped up to the plate in his absence.
"It doesn't matter who scores, I'm happy so long as we're scoring," added Van Der Merwe.
"Tim's on the wing in my position when he scores. It is great having guys like Tim scoring tries. It shows it is a team collective here and we are all playing for each other. As long as we get four tries and a bonus point it is great for the team.
"If we can spread it around the park, with some other guys scoring, then it is really a bonus for the whole team."
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