diff --git a/logger.go b/logger.go
index 533ad6d..20501e2 100644
--- a/logger.go
+++ b/logger.go
@@ -25,6 +25,7 @@ type Logger interface {
 	// StringField is a field with a string value
 	StringField(label string, val string) Logger
 
+	// WithFields is willy-nilly key value pairs.
 	WithFields(fields map[string]interface{}) Logger
 
 	// Printf is called last to emit the log at the given