diff --git a/99-pico.rules b/99-pico.rules
new file mode 100644
index 0000000..69dccb9
--- /dev/null
+++ b/99-pico.rules
@@ -0,0 +1,9 @@
+# /etc/udev/rules.d/99-pico.rules
+
+# Make an RP2040 in BOOTSEL mode writable by all users, so you can `picotool`
+# without `sudo`. 
+SUBSYSTEM=="usb", ATTRS{idVendor}=="2e8a", ATTRS{idProduct}=="0003", MODE="0666"
+SUBSYSTEM=="usb", ATTRS{idVendor}=="2e8a", ATTRS{idProduct}=="000a", MODE="0666"
+
+# Symlink an RP2040 running USB UART as /dev/pico.
+SUBSYSTEM=="tty", ATTRS{idVendor}=="2e8a", ATTRS{idProduct}=="000a", SYMLINK+="pico"