diff --git a/draft-marchan-kdl2.md b/draft-marchan-kdl2.md
index b1bba0c..008b9a5 100644
--- a/draft-marchan-kdl2.md
+++ b/draft-marchan-kdl2.md
@@ -97,7 +97,7 @@ The toplevel concept of KDL is a Document. A Document is composed of zero or
 more Nodes ({{node}}), separated by newlines and whitespace, and eventually
 terminated by an EOF.
 
-All KDL documents should be UTF-8 encoded and conform to the specifications in
+All KDL documents MUST be encoded in UTF-8 and conform to the specifications in
 this document.
 
 ### Example