diff --git a/readme.md b/readme.md
index 4b89ccf..bc0177e 100644
--- a/readme.md
+++ b/readme.md
@@ -1 +1,5 @@
-"Chess game"
\ No newline at end of file
+"Chess game"
+
+---sources---
+
+https://www.pygame.org/docs/tut/ImportInit.html
\ No newline at end of file