(auto-mode-alist): Recognize .sgm, .sgml, .dtd.

1 files changed, 3 insertions, 0 deletions

diff --git a/lisp/files.el b/lisp/files.el
index 9d94626948f..30f04dfd2ee 100644
--- a/lisp/files.el
+++ b/lisp/files.el
@@ -742,6 +742,9 @@ run `normal-mode' explicitly."
                                   ("\\.lex\\'" . c-mode)
                                   ("\\.oak\\'" . scheme-mode)
                                   ("\\.scm.[0-9]*\\'" . scheme-mode)
+                                  ("\\.sgm\\'" sgml-mode)
+                                  ("\\.sgml\\'" sgml-mode)
+                                  ("\\.dtd\\'" sgml-mode)
                                   ;; .emacs following a directory delimiter
                                   ;; in either Unix or VMS syntax.
                                   ("[]>:/]\\..*emacs\\'" . emacs-lisp-mode)