diff --git a/tools/uf2/README.md b/tools/uf2/README.md
index a169616..8817720 100644
--- a/tools/uf2/README.md
+++ b/tools/uf2/README.md
@@ -1,2 +1,4 @@
 # uf2
 USB Flashing Format (UF2) for your build.zig
+
+This is currently WIP and untested.