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-rw-r--r--roman.go8
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diff --git a/roman.go b/roman.go
index afcdbdd..b5886ba 100644
--- a/roman.go
+++ b/roman.go
@@ -1,5 +1,13 @@
// Package roman numerals
//
+// For fluff, the unicode overbar is recognized as a factor of 1000.
+//
+// If you see boxes in the code below, those are supposed to be the
+// Unicode combining overline (U+0305) and look like I̅V̅X̅L̅C̅D̅M̅. Or, if
+// you see overstruck combinations of letters, that's a different font
+// rendering problem. (If you need roman numerals > 3999 reliably, it
+// might best to stick to chiseling them in stone...)
+//
// Source: https://www.rosettacode.org/wiki/Roman_numerals/Encode#Go
package roman