diff --git a/plot/README.md b/plot/README.md
index 6e30050..08a4208 100644
--- a/plot/README.md
+++ b/plot/README.md
@@ -8,6 +8,12 @@ ZIP seeedstudio to a file
     zip -r /tmp/ulx3s-pcb.zip seeedstudio
 
 Open [Seeedstudio PCB production](https://www.seeedstudio.com/fusion_pcb.html)
-page, select 4-layer board, 
+page, select:
+
+    Layer: 4-layer board
+    Min Solder Mask: 0.1 mm
+    Min Hole size: 0.2 mm
+    Min Tracking/Spacing: 5/5 mils
+
 click "Add your gerber file" and upload this zip file then
 click on "Gerber Viewer" to see what will be produced.