Jan Loeser enhanced the theforeman/foreman-documentation repository by expanding PXE provisioning documentation to support Secure Boot across multiple Linux distributions, including AlmaLinux, Debian, Rocky Linux, and Ubuntu. Focusing on system administration and Linux provisioning, Jan clarified validation steps and improved cross-distro guidance to streamline onboarding and reduce misconfigurations. The work detailed the integration of shim and GRUB2 binaries via TFTP smart-proxies, enabling consistent Secure Boot workflows for arbitrary client operating systems. Using adoc for documentation, Jan’s contributions provided depth by addressing both technical implementation and user experience, laying a foundation for broader Secure Boot adoption in heterogeneous environments.