diff --git a/.gitmodules b/.gitmodules
index c5ec843..2f3e7db 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,6 @@
 [submodule "lib/bme280"]
 	path = lib/bme280
 	url = git@github.com:lafftale1999/bme280_driver.git
+[submodule "pico-sdk"]
+	path = pico-sdk
+	url = https://github.com/raspberrypi/pico-sdk.git