--- a/doc/hgrc.5.txt
+++ b/doc/hgrc.5.txt
@@ -388,6 +388,9 @@ ui::
     Print debugging information.  True or False.  Default is False.
   editor;;
     The editor to use during a commit.  Default is $EDITOR or "vi".
+  fallbackencoding;;
+    Encoding to try if it's not possible to decode the changelog using
+    UTF-8.  Default is ISO-8859-1.
   ignore;;
     A file to read per-user ignore patterns from. This file should be in
     the same format as a repository-wide .hgignore file. This option