diff --git a/BUILDING.md b/BUILDING.md
index fd7cfd0a8..6706d960d 100644
--- a/BUILDING.md
+++ b/BUILDING.md
@@ -85,6 +85,8 @@ _Note: If you're using Visual Studio Code, the [cpack plugin](https://marketplac
 # Clone the repo
 git clone https://github.com/HarbourMasters/Shipwright.git
 cd Shipwright
+# Clone the submodule libultraship
+git submodule update --init
 # Copy the baserom to the OTRExporter folder
 cp <path to your ROM> OTRExporter
 # Generate Ninja project
@@ -123,6 +125,8 @@ _Note: If you're using Visual Studio Code, the [cpack plugin](https://marketplac
 # Clone the repo
 git clone https://github.com/HarbourMasters/Shipwright.git
 cd ShipWright
+# Clone the submodule libultraship
+git submodule update --init
 # Copy the baserom to the OTRExporter folder
 cp <path to your ROM> OTRExporter
 # Generate Ninja project