improve readme

README.md

@@ -4,6 +4,8 @@
 
 Whether you are attending a conference or just getting started with embedded development, NiceBadge gives you a real piece of hardware to hack on, complete with a ready-to-use firmware, step-by-step tutorials, and progressively more advanced examples that unlock every capability of the board.
 
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 ![NiceBadge PCB render](assets/pcb1.png)
@@ -106,6 +108,14 @@ The tutorial series walks you through every peripheral of the badge, starting fr
 
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+## Acknowledgements
+
+NiceBadge is based on the **[conf2025badge](https://github.com/sago35/keyboards/tree/main/conf2025badge)** by [sago35](https://github.com/sago35), which debuted at the TinyGo Conference in Japan. NiceBadge shares the same form-factor and was built on top of the groundwork たかさごさん laid there.
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+Thank you, for the inspiration, the open design, and all the work that made this possible.
+
+---
+
 ## License
 
 See [LICENSE](LICENSE).

hardware/PCB-kicad/nicebadge.kicad_prl

@@ -53,7 +53,7 @@
       "board_outline_area",
       "ly_points"
     ],
-    "visible_layers": "ffffffff_ffffffff_ffffffff_ffffffdf",
+    "visible_layers": "ffffffff_ffffffff_ffffffff_ffffffff",
     "zone_display_mode": 0
   },
   "git": {