diff --git a/transport/grpc/resolver/discovery/builder.go b/transport/grpc/resolver/discovery/builder.go
index 015c20f1a..6186cdf1d 100644
--- a/transport/grpc/resolver/discovery/builder.go
+++ b/transport/grpc/resolver/discovery/builder.go
@@ -31,7 +31,7 @@ func WithInsecure(insecure bool) Option {
 	}
 }
 
-// WithInsecure with isSecure option.
+// WithSubset with subset size.
 func WithSubset(size int) Option {
 	return func(b *builder) {
 		b.subsetSize = size