diff --git a/extras/schematics/README.md b/extras/schematics/README.md
index 1640261..4640a74 100644
--- a/extras/schematics/README.md
+++ b/extras/schematics/README.md
@@ -7,4 +7,6 @@ Suitable for two different narrower ESP32 devkit board types with different pino
 
 Pinout configuration is done via solder pads.
 
+⚠ **There are ESP32 boards with different socket widths: 22mm and 25mm, board files for 25mm have _wide siffux in file names.**
+
 ![Board](../images/board.png)