diff --git a/tests/nested_easy.go b/tests/nested_easy.go
index c7f0f4b..6309a49 100644
--- a/tests/nested_easy.go
+++ b/tests/nested_easy.go
@@ -19,5 +19,7 @@ type NestedEasyMarshaler struct {
 var _ easyjson.Marshaler = &NestedEasyMarshaler{}
 
 func (i *NestedEasyMarshaler) MarshalEasyJSON(w *jwriter.Writer) {
+	// We use this method only to indicate that easyjson.Marshaler
+	// interface was really used while encoding.
 	i.EasilyMarshaled = true
 }
\ No newline at end of file