From 03f1b0816d85fbc285a72695b969deb03ca568df Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ciro=20Santilli=20=E5=85=AD=E5=9B=9B=E4=BA=8B=E4=BB=B6=20?=
 =?UTF-8?q?=E6=B3=95=E8=BD=AE=E5=8A=9F?= <ciro.santilli@gmail.com>
Date: Tue, 26 Jan 2021 00:00:00 +0000
Subject: [PATCH] qemu build userland

---
 README.adoc | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/README.adoc b/README.adoc
index 46251ab..b8e805c 100644
--- a/README.adoc
+++ b/README.adoc
@@ -4014,6 +4014,23 @@ If you modify the userland programs, rebuild simply with:
 ./build-userland
 ....
 
+To rebuild just QEMU userland if you hack it, use:
+
+....
+./build-qemu --mode userland
+....
+
+The:
+
+....
+--mode userland
+....
+
+is needed because QEMU has two separate executables:
+
+* `qemu-x86_64` for userland
+* `qemu-system-x86_64` for full system
+
 ==== User mode GDB
 
 It's nice when <<gdb,the obvious>> just works, right?