diff --git a/src/implementation.md b/src/implementation.md
index e3e453e..e037f33 100644
--- a/src/implementation.md
+++ b/src/implementation.md
@@ -2,3 +2,8 @@
 
 The aim of LinuxBoot is to reduce complexity and obscure firmware by moving
 that functionality into kernel and user-space.
+
+Since there are multiple approaches to initialize the platform, such as [UEFI
+PI](uefi-pi-retrofit.md), U-Boot XPL, barebox PBL, coreboot and oreboot, and
+hardware vendors differ in openness, different strategies are required,
+explained in this chapter.