diff --git a/src/cmo.adoc b/src/cmo.adoc
index 710106ea..451689e6 100644
--- a/src/cmo.adoc
+++ b/src/cmo.adoc
@@ -559,7 +559,7 @@ generic format:
 |===
 | Bits    | Name     | Description
 
-| [5:4]   | `CBIE`   | Cache Block Invalidate instruction Enable
+| [5:4]   | `CBIE`   | Cache Block Invalidate instruction Enable.  *WARL*.
 
 Enables the execution of the cache block invalidate instruction, `CBO.INVAL`, in
 a lower privilege mode: