diff --git a/tests/50-constraint-OK.asn1 b/tests/50-constraint-OK.asn1
index b8812bc..d0692c5 100644
--- a/tests/50-constraint-OK.asn1
+++ b/tests/50-constraint-OK.asn1
@@ -45,8 +45,9 @@
 	SIZE-and-FROM ::= PER-Visible (SIZE(1..4) ^ FROM("ABCD"))
 	Neither-SIZE-nor-FROM ::= PER-Visible (SIZE(1..4) | FROM("ABCD",...))
 
-	Utf8-3 ::= Utf8-2 (FROM("A".."Z"|"a".."z"))
-	Utf8-2 ::= Utf8-1 (SIZE(1..2))
+	Utf8-4 ::= UTF8String (FROM("A".."Z"|"a".."z"))	-- Alphabet
+	Utf8-3 ::= Utf8-2 (FROM("A".."Z"|"a".."z"))	-- Alphabet and size
+	Utf8-2 ::= Utf8-1 (SIZE(1..2))			-- Size
 	Utf8-1 ::= UTF8String
 
 	VisibleIdentifier ::= Identifier