diff --git a/etc/README b/etc/README
index ea843095c25..5bbd1fe4b49 100644
--- a/etc/README
+++ b/etc/README
@@ -3,6 +3,7 @@ with Emacs.  This includes some text files of documentation for GNU
 Emacs or of interest to Emacs users, and the file of dumped docstrings
 for Emacs functions and variables.
 
+`forms-d2.dat' is an example data file used by forms-d2.el.
 
 `termcap.src' is included mainly for VMS.  It is a copy of the
 `/etc/termcap' file used on Unix.