diff --git a/README.adoc b/README.adoc
index 1245263..38667af 100644
--- a/README.adoc
+++ b/README.adoc
@@ -1698,11 +1698,18 @@ But keep in mind that it only affects benchmark performance of the most detailed
 |===
 |arch |CPU type |caches used
 |X86 |`AtomicSimpleCPU` | no
-|X86 |`DerivO3CPU` | ?
+|X86 |`DerivO3CPU` | ?*
 |ARM |`AtomicSimpleCPU` | no
 |ARM |`HPI` | yes
 |===
 +
+{empty}*: couldn't test because of:
++
+--
+** https://stackoverflow.com/questions/49011096/how-to-switch-cpu-models-in-gem5-after-restoring-a-checkpoint-and-then-observe-t
+** https://github.com/gem5/gem5/issues/16
+--
++
 This has been verified with:
 +
 ....