diff --git a/arduino/README.md b/arduino/README.md
index 8fe3c72..5940ff1 100644
--- a/arduino/README.md
+++ b/arduino/README.md
@@ -1,2 +1,2 @@
-Sources from http://compcar.ru/forum/showthread.php?t=3959
+Sources from http://www.compcar.ru/forum/showthread.php?t=4835 and  http://compcar.ru/forum/showthread.php?t=3959