StrFunc.nsh hates me

I am attempting to call the StrTok macro/function, and I am getting an error:

macro "FUNCTION_STRING_StrTok" requires 0 parameter(s), passed 5!

Here is the line in my script:

${StrTok} $1 $0 "," 3 0

What's the problem? How do I pass parameters to these things?

Oh never mind. Figured it out. Weird implementation, tho'.