diff --git a/README.md b/README.md
index 63430c8..cac4245 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,8 @@ This repostory contains [buildroot](http://buildroot.uclibc.org/) configurations
 
 It includes three different configuration: the default config `coreboot_defconfig`, a minimal config `coreboot_minimal_defconfig` which can fit on the X230 without hardware modifications (but lacks some extra goodies), and a grsec configuration for both of these.
 
+Installing on the X220 requires hardware modification as the flash has to be upgraded to 16MiB. We used the W25Q128.V model.
+
 It comes out of the box with some useful goodies such as fully randomized MAC and hostname.
 
 Some of the coreboot utility (ie: cbfstool, ifdtool, and nvramtool) packages are built from a local source. you will need to edit this path in `packages/coreboot/*/*.mk`