diff --git a/README.adoc b/README.adoc
index 0aa951b..7b48ab3 100644
--- a/README.adoc
+++ b/README.adoc
@@ -904,6 +904,20 @@ See also:
 * http://stackoverflow.com/questions/11408041/how-to-debug-the-linux-kernel-with-gdb-and-qemu/33203642#33203642
 * http://stackoverflow.com/questions/4943857/linux-kernel-live-debugging-how-its-done-and-what-tools-are-used/42316607#42316607
 
+==== GDB step debug kernel boot other archs
+
+Just don't forget to pass `--arch` to `./run-gdb`, e.g.:
+
+....
+./run --arch aarch64 --wait-gdb
+....
+
+and:
+
+....
+./run-gdb --arch aarch64 start_kernel
+....
+
 [[kernel-o0]]
 ==== Disable kernel compiler optimizations