question about default site file

[Bill Schoolfield]

I'm writing a little tool that our clients will execute to configure 
their freeradius instance (given a stock - nothing changed yet setup). 
Basically it parses the various setup files and makes substitutions, 
changes, etc. The idea here is the client won't (shouldn't) edit the 
files manually.

Anyway I noticed that the files ship with sql module directives with a 
prefixed dash. Ie. -sql

What's the meaning of this? Couldn't find it documented anywhere. 
Another comment method? Something else?

Bill