Update src/system.adoc

Co-authored-by: Alexander Richardson <mail@alexrichardson.me>
Signed-off-by: Andres Amaya Garcia <andresag1118@gmail.com>

src/system.adoc

@@ -18,6 +18,7 @@ The fundamental rule for any CHERI system is that the tag and data are always ac
 
 . Update any data bytes without also writing the tag
 .. This implies clearing the tag if a non-CHERI aware bus master overwrites a capability in memory
+. Read a tagged value with mismatched (stale or newer) data
 . Set the tag without also writing the data.
 
 NOTE: Clearing tags in memory does not necessarily require updating the associated data.