diff --git a/unicodetools/src/main/java/org/unicode/text/UCD/TestUnicodeInvariants.java b/unicodetools/src/main/java/org/unicode/text/UCD/TestUnicodeInvariants.java
index deb75b75a..714cafc92 100644
--- a/unicodetools/src/main/java/org/unicode/text/UCD/TestUnicodeInvariants.java
+++ b/unicodetools/src/main/java/org/unicode/text/UCD/TestUnicodeInvariants.java
@@ -2052,6 +2052,7 @@ public static UnicodeSet parseUnicodeSet(String source, ParsePosition pp)
                                     ' ');
                         });
         for (int p : badEscapePositions) {
+            // Simplest way to throw an exception for only the first list element.
             throw new ParseException("No character matching \\N escape", initialPosition + p);
         }
         var patchedParsePosition = new ParsePosition(0);