diff --git a/config/options.go b/config/options.go
index a5065072..a2b9cbc2 100644
--- a/config/options.go
+++ b/config/options.go
@@ -148,7 +148,7 @@ func Extractor(format interface{}, extractor jaeger.Extractor) Option {
 	}
 }
 
-// WithRandomNumber set the Tracer random number func
+// WithRandomNumber supplies a random number generator function to the Tracer used to generate trace and span IDs.
 func WithRandomNumber(f func() uint64) Option {
 	return func(c *Options) {
 		c.randomNumber = f