diff --git a/docs/99_developer_guide.md b/docs/99_developer_guide.md
index c98f9fa8..8d0e8bf0 100644
--- a/docs/99_developer_guide.md
+++ b/docs/99_developer_guide.md
@@ -71,3 +71,6 @@ You can then serve the webpage:
 ```bash
 cd output/docs && jekyll serve
 ```
+
+### Test ability to Customize the font
+Add a `font64` file to the `menu` directory called "custom.font64". You can build a font64 file with the `libdragon` tools.