diff --git a/index.md b/index.md
index e3d512b..0010253 100644
--- a/index.md
+++ b/index.md
@@ -13,6 +13,8 @@ title: "ESP32-S3 Uno Development Board"
 
 [Schematic](schematic.md)
 
+https://github.com/alexandrebobkov/ESP32-S3_Arduino-Uno/blob/9575373f9068746664d09406c00251d1236720c5/assets/ESP32-S3_Arduino-Schematic_v5.2.pdf
+
 [Troubleshooting Steps](troubleshooting.md)
 
 ## Compatibility with MicroPython