diff --git a/README.adoc b/README.adoc
index d17066c..c8e1916 100644
--- a/README.adoc
+++ b/README.adoc
@@ -1931,6 +1931,8 @@ Remote replied unexpectedly to 'vMustReplyEmpty': timeout
 
 I wanted to try to and run run KGDB on a second serial to see if it makes a difference, but QEMU `-M virt` does not seem to support it: https://stackoverflow.com/questions/53080745/can-qemu-m-virt-on-arm-aarch64-have-multiple-serial-ttys-like-such-as-pl011-t
 
+Tested on d089c4660615abaf5ae16255fc0195cf989ce437.
+
 === KGDB kernel modules
 
 In QEMU: