diff --git a/.gitignore b/.gitignore
index 0e7933d..60c69d0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
+build
+
 # ---> CMake
 CMakeLists.txt.user
 CMakeCache.txt
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..172894d
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,9 @@
+[submodule "FreeRTOS-Kernel"]
+	path = submodules/FreeRTOS-Kernel
+	url = https://github.com/FreeRTOS/FreeRTOS-Kernel.git
+[submodule "pico-sdk"]
+	path = submodules/pico-sdk
+	url = https://github.com/raspberrypi/pico-sdk.git
+[submodule "picotool"]
+	path = submodules/picotool
+	url = https://github.com/raspberrypi/picotool.git
diff --git a/README.md b/README.md
index 08f2045..c58658a 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,6 @@
+Remember to `git submodule update --init`
+
 # SomeFreeRTOSExamples
 
-Trying to get a zero-friction FreeRTOS + RP2040 setup, and examples.
\ No newline at end of file
+Trying to get a zero-friction FreeRTOS + RP2040 setup, and examples.
+
diff --git a/REMEMBER_TO_INIT_SUBMODULES.md b/REMEMBER_TO_INIT_SUBMODULES.md
new file mode 100644
index 0000000..dd71ade
--- /dev/null
+++ b/REMEMBER_TO_INIT_SUBMODULES.md
@@ -0,0 +1 @@
+Remember to `git submodule update --init`
diff --git a/submodules/FreeRTOS-Kernel b/submodules/FreeRTOS-Kernel
new file mode 160000
index 0000000..7d76dce
--- /dev/null
+++ b/submodules/FreeRTOS-Kernel
@@ -0,0 +1 @@
+Subproject commit 7d76dceaadd22bfdd6a77973f8c0b7b46cb326c5
diff --git a/submodules/pico-sdk b/submodules/pico-sdk
new file mode 160000
index 0000000..efe2103
--- /dev/null
+++ b/submodules/pico-sdk
@@ -0,0 +1 @@
+Subproject commit efe2103f9b28458a1615ff096054479743ade236
diff --git a/submodules/picotool b/submodules/picotool
new file mode 160000
index 0000000..bf33c6d
--- /dev/null
+++ b/submodules/picotool
@@ -0,0 +1 @@
+Subproject commit bf33c6ddd756c3961c7a13b000859b71e825ee74