diff --git a/BPM/notation/BPMN/README.md b/BPM/notation/BPMN/README.md
index 79b69620..9f6878f8 100644
--- a/BPM/notation/BPMN/README.md
+++ b/BPM/notation/BPMN/README.md
@@ -11,6 +11,7 @@ BPMN2
 - [camunda.com](https://camunda.com/bpmn/reference/)
 ### en spec
 - omg, v2.0.2 December 2013 [PDF](https://www.omg.org/spec/BPMN/2.0.2/PDF), ссылка на 13 BPMN Execution Semantics [стр. 455](https://www.omg.org/spec/BPMN/2.0.2/PDF#page=455). В папке лежит вырезка, через https://bigpdf.11zon.com/en/split-pdf/
+- [studfile.net, раздел  Semantics](https://studfile.net/preview/16431197/page:117/)
 - [стартовая](https://www.omg.org/spec/BPMN/2.0.2/)
 
 ### BPMN Semantic