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-rw-r--r--lisp/files.el2
1 files changed, 1 insertions, 1 deletions
diff --git a/lisp/files.el b/lisp/files.el
index 91e046bc4a..ff6b692769 100644
--- a/lisp/files.el
+++ b/lisp/files.el
@@ -3241,7 +3241,7 @@ Return the new variables list."
(setq variables (dir-locals-collect-mode-variables
(cdr entry) variables))))))))
-(defun dir-locals-set-directory-class (directory class mtime)
+(defun dir-locals-set-directory-class (directory class &optional mtime)
"Declare that the DIRECTORY root is an instance of CLASS.
DIRECTORY is the name of a directory, a string.
CLASS is the name of a project class, a symbol.