diff --git a/source/Ox/js/Format.js b/source/Ox/js/Format.js
index 1e52cbf7..fa4ae0ef 100644
--- a/source/Ox/js/Format.js
+++ b/source/Ox/js/Format.js
@@ -637,8 +637,10 @@ Ox.formatRoman <f> Formats a number as a roman numeral
     'MDCCCLXXXVIII'
     > Ox.formatRoman(1999)
     'MCMXCIX'
-    > Ox.formatRoman(2002)
-    'MMII'
+    > Ox.formatRoman(2000)
+    'MM'
+    > Ox.formatRoman(-1)
+    ''
     > Ox.formatRoman(0)
     ''
     > Ox.formatRoman(9.9)