diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..643f237
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "pico-sdk"]
+	path = pico-sdk
+	url = https://github.com/raspberrypi/pico-sdk
diff --git a/README.md b/README.md
index 8b0c956..f154e16 100644
--- a/README.md
+++ b/README.md
@@ -40,7 +40,6 @@ I used VS code but you only need a terminal for building this.
 ### Pico firmware
 Requires the following software: `git`, `make`, `cmake` and a C compiler
 ```
-(TODO make sure pico-sdk is a submodule)
 git clone https://git.crispypin.cc/CrispyPin/wind_station --recursive
 ```
 Now edit the file `pico/src/wifi_cred.h` and update the values accordingly.
diff --git a/pico-sdk b/pico-sdk
new file mode 160000
index 0000000..ee68c78
--- /dev/null
+++ b/pico-sdk
@@ -0,0 +1 @@
+Subproject commit ee68c78d0afae2b69c03ae1a72bf5cc267a2d94c