diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..f9fafc7
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,9 @@
+[submodule "pico-examples"]
+	path = pico-examples
+	url = https://github.com/raspberrypi/pico-examples.git
+[submodule "pico-sdk"]
+	path = pico-sdk
+	url = https://github.com/raspberrypi/pico-sdk.git
+[submodule "picotool"]
+	path = picotool
+	url = https://github.com/raspberrypi/picotool.git
diff --git a/pico-sdk b/pico-sdk
new file mode 160000
index 0000000..2e6142b
--- /dev/null
+++ b/pico-sdk
@@ -0,0 +1 @@
+Subproject commit 2e6142b15b8a75c1227dd3edbe839193b2bf9041
diff --git a/picotool b/picotool
new file mode 160000
index 0000000..03f2812
--- /dev/null
+++ b/picotool
@@ -0,0 +1 @@
+Subproject commit 03f28122cc170535f35e5bf8fa37be024489f5eb