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-rw-r--r--lisp/progmodes/tcl.el2
1 files changed, 1 insertions, 1 deletions
diff --git a/lisp/progmodes/tcl.el b/lisp/progmodes/tcl.el
index 58b8be8c7ba..29096a23046 100644
--- a/lisp/progmodes/tcl.el
+++ b/lisp/progmodes/tcl.el
@@ -545,7 +545,7 @@ Uses variables `tcl-proc-regexp' and `tcl-keyword-list'."
;;
;;;###autoload
-(define-derived-mode tcl-mode nil "Tcl"
+(define-derived-mode tcl-mode prog-mode "Tcl"
"Major mode for editing Tcl code.
Expression and list commands understand all Tcl brackets.
Tab indents for Tcl code.