1 files changed, 1 insertions, 0 deletions

diff --git a/lisp/files.el b/lisp/files.el
index 3ba373c8c87..e0b4738ed26 100644
--- a/lisp/files.el
+++ b/lisp/files.el
@@ -971,6 +971,7 @@ run `normal-mode' explicitly."
     ("\\.article\\'" . text-mode)
     ("\\.letter\\'" . text-mode)
     ("\\.tcl\\'" . tcl-mode)
+    ("\\.exp\\'" . tcl-mode)
     ("\\.f90\\'" . f90-mode)
     ("\\.lsp\\'" . lisp-mode)
     ("\\.awk\\'" . awk-mode)