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-rw-r--r--lisp/gnus/gnus-sum.el3
1 files changed, 2 insertions, 1 deletions
diff --git a/lisp/gnus/gnus-sum.el b/lisp/gnus/gnus-sum.el
index 0e81f95cd15..9992f46bbd5 100644
--- a/lisp/gnus/gnus-sum.el
+++ b/lisp/gnus/gnus-sum.el
@@ -315,7 +315,8 @@ This can either be a regular expression or list of regular expressions
that will be removed from subject strings if fuzzy subject
simplification is selected."
:group 'gnus-thread
- :type '(repeat regexp))
+ :type '(choice regexp
+ (repeat regexp)))
(defcustom gnus-show-threads t
"If non-nil, display threads in summary mode."