1 files changed, 7 insertions, 3 deletions
diff --git a/README.md b/README.md
index 539c6ec..f28e196 100644
--- a/README.md
+++ b/README.md
@@ -1,13 +1,17 @@
 # docker
 
-Cloned from https://github.com/moby/moby/tree/master/contrib
+Cloned from https://github.com/moby/moby/tree/master/contrib/mkimage-arch.sh
 
 # usage
 
+Choose an ARCHITECTURE in `mkimage-arch.sh` and set the corresponding
+variable on top (for all practical purposes this should be 'pentium4').
+
 Run `mkimage-arch.sh` builds a docker image named `archlinux32`
 using `i686` architecture packages.
 
 Run `uname -m` in the shell started with
 `docker run -it archlinux32 /usr/bin/linux32 /bin/bash` indeed
-shows `i686`.
-
+shows `i686` (Note: it shows `i686` for `i686` and `pentium4`,
+also note that a docker chroot doesn't emulate CPU flags like SSE/SSE2 in
+`/proc/cpuinfo`!).