diff --git a/keyboards/ergodox/readme.md b/keyboards/ergodox/readme.md
index 9f8941863..c3aa6c9da 100644
--- a/keyboards/ergodox/readme.md
+++ b/keyboards/ergodox/readme.md
@@ -3,6 +3,7 @@
 To build an Infinity firmware under Ubuntu (tested on 15.10):
 
   - Run the `util/install_dependencies.sh` script as root.
+  - Check out the submodules with `git submodule update --init --recursive`
   - Build the firmware with `make keymap=keymapname subproject=infinity`
   - Plug in the left hand keyboard only.
   - Press the program button (back of keyboard, above thumb pad).