diff --git a/revid/senders.go b/revid/senders.go
index cd219712..04c96566 100644
--- a/revid/senders.go
+++ b/revid/senders.go
@@ -52,6 +52,7 @@ type Sender interface {
 	send(d []byte) error
 }
 
+// Log is used by the multiSender.
 type Log func(level int8, message string, params ...interface{})
 
 // multiSender implements io.Writer. It provides the capacity to send to multiple
@@ -61,6 +62,7 @@ type multiSender struct {
 	log     Log
 }
 
+// newMultiSender returns a pointer to a new multiSender.
 func newMultiSender(senders []loadSender, log Log) *multiSender {
 	return &multiSender{
 		senders: senders,