diff --git a/README.adoc b/README.adoc
index d5bb0f0..7b5ad66 100644
--- a/README.adoc
+++ b/README.adoc
@@ -835,7 +835,7 @@ continue
 
 This is of least reliable setup as there might be other processes that use the given virtual address.
 
-== Architecture
+== Architectures
 
 The portability of the kernel and toolchains is amazing: change an option and most things magically work on completely different hardware.
 
@@ -856,6 +856,23 @@ Debug:
 
 Known quirks of the supported architectures are documented in this section.
 
+=== x86
+
+You can make QEMU <<gem5-vs-qemu-performance,run faster>> by passing it the `-enable-kvm` option as in:
+
+....
+./run - -enable-kvm
+....
+
+This uses the link:https://en.wikipedia.org/wiki/Kernel-based_Virtual_Machine[KVM Linux kernel feature] of the host to run most instructions natively, and therefore.
+
+There are several downsides to this however:
+
+* only works for x86 guest
+* limits visibility, since more things are running natively
+
+So for those reasons we don't turn it on by default.
+
 === arm
 
 TODOs: