Merge branch 'master' into wip/main-controller

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diff --git a/readme.md b/readme.md
index 01fd063..1ad72e9 100644
--- a/readme.md
+++ b/readme.md
@@ -2,6 +2,18 @@
 
 Avans University of Applied Sciences project puzzle box.
 
+## submodules
+
+This repository tracks (most) dependencies via git submodules.
+
+If something is complaining about missing files
+
+```
+git submodule update --init --recursive --depth 1
+```
+
+until your problems go away.
+
 ## Tests
 
 ```