diff --git a/decor/decorators.go b/decor/decorators.go
index aa68f48..938b392 100644
--- a/decor/decorators.go
+++ b/decor/decorators.go
@@ -60,6 +60,11 @@
 	Decor(*Statistics, chan<- int, <-chan int) string
 }
 
+// CompleteMessenger is an interface with one method:
+//
+//	OnComplete(string, ...WC)
+//
+// Decorators implementing this interface suppose to return provided string on complete event.
 type CompleteMessenger interface {
 	OnComplete(string, ...WC)
 }