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-rw-r--r--lisp/textmodes/spell.el2
1 files changed, 1 insertions, 1 deletions
diff --git a/lisp/textmodes/spell.el b/lisp/textmodes/spell.el
index bd58262963b..e8fe420a842 100644
--- a/lisp/textmodes/spell.el
+++ b/lisp/textmodes/spell.el
@@ -46,7 +46,7 @@
"*Filter function to process text before passing it to spell program.
This function might remove text-processor commands.
nil means don't alter the text before checking it."
- :type 'function
+ :type '(choice (const nil) function)
:group 'spell)
;;;###autoload