diff --git a/setting-up-the-pico-sdk.md b/setting-up-the-pico-sdk.md
index 0ad2b1b5..0a2f634a 100644
--- a/setting-up-the-pico-sdk.md
+++ b/setting-up-the-pico-sdk.md
@@ -63,6 +63,7 @@ cd ../../../
 ```bash
 git clone https://github.com/pimoroni/pimoroni-pico.git
 cd pimoroni-pico
+git submodule update --init
 mkdir build
 ```