diff --git a/draft-ietf-sidrops-rov-no-rr.xml b/draft-ietf-sidrops-rov-no-rr.xml
index ef2ed29..6b704d9 100644
--- a/draft-ietf-sidrops-rov-no-rr.xml
+++ b/draft-ietf-sidrops-rov-no-rr.xml
@@ -235,7 +235,7 @@
 
     <t>
       If the BGP speaker has insufficient resources to support either of
-      the two proposed options, it MUST not be used for Route Origin
+      the two proposed options, it MUST NOT be used for Route Origin
       Validation.  I.e. the knob in <xref target="rib"/> should only be
       used in very well known and controlled circumstances.
     </t>