diff --git a/submodules/README.md b/submodules/README.md
index b5432d40..037a3af8 100644
--- a/submodules/README.md
+++ b/submodules/README.md
@@ -5,9 +5,17 @@ This allows you to grab source changes directly, as well as _pushing_ them back.
 
 ## Setup
 
+> NOTE:
+> Unfortunately for us, 2.38.1 introduces a change (due to CVE-2022-39253) that disables git submodule add using the file protocol.
+> as the setup script for this exercise relies on cloning a local repository, it will only work if you specifically allow this before running the script.
+> `git config --global protocol.file.allow always`
+>
+> If you want to remove this "opening" afterward, you should wait until you are done with the whole exercise, and then run:
+> `git config --global --unset protocol.file.allow`
+
 1. Run `source setup.sh` (or `.\setup.ps1` in PowerShell)
 
-> NOTE: If running setup.sh on windows, you can run into problems by sourcing the setup script. Instead, run `./setup.sh`, and the folders would be created correctly.
+> NOTE: If running setup.sh on Windows, you can run into problems by sourcing the setup script. Instead, run `./setup.sh`, and the folders would be created correctly.
 
 ## The task