diff --git a/doc/emacs/mule.texi b/doc/emacs/mule.texi
index ab6125f5745..55dd74c48a3 100644
--- a/doc/emacs/mule.texi
+++ b/doc/emacs/mule.texi
@@ -1871,6 +1871,12 @@ they too are defined to compose with the following character, once
 @code{iso-transl} is loaded.
 
 Use @kbd{C-x 8 C-h} to list all the available @kbd{C-x 8} translations.
+
+The set of translations available can be extended with certain
+language-specific characters using the @kbd{M-x iso-transl-set-language}
+command.  Current supported languages are: @samp{French}, @samp{German},
+@samp{Portuguese}, @samp{Spanish}, and @samp{Esperanto}.  See
+@code{iso-transl-language-alist} for details.
 @end itemize
 
 @node Charsets