diff --git a/README b/README
index 7bcaa7b04..88bfab1b1 100644
--- a/README
+++ b/README
@@ -801,6 +801,8 @@ as `title`, `author`, and `date`) as well as the following:
 :   causes links to be printed as footnotes in LaTeX documents
 `biblio-style`
 :   bibliography style in LaTeX, when used with `--natbib`
+`biblio-files`
+:   bibliography files to use in LaTeX, with `--natbib` or `--biblatex`
 `section`
 :   section number in man pages
 `header`