- 2, 0, 0, (SCM sev, SCM sym),
- "Get the property @var{sym} of stream event @var{mus}."
- " If @var{sym} is undefined, return @code{'()}.")
+ 2, 1, 0, (SCM sev, SCM sym, SCM val),
+ "Get the property @var{sym} of stream event @var{sev}."
+ " If @var{sym} is undefined, return @var{val} or"
+ " @code{'()} if @var{val} is not specified.")