diff --git a/README b/README
index fbde4eab1..50ef81849 100644
--- a/README
+++ b/README
@@ -393,8 +393,8 @@ Options affecting specific writers
     or reStructuredText.  By default inline links are used.
 
 `--atx-headers`
-:   Use ATX style headers in markdown output. The default is to use
-    setext-style headers for levels 1-2, and then ATX headers.
+:   Use ATX style headers in markdown and asciidoc output. The default is
+    to use setext-style headers for levels 1-2, and then ATX headers.
 
 `--chapters`
 :   Treat top-level headers as chapters in LaTeX, ConTeXt, and DocBook