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diff --git a/doc/misc/gnus.texi b/doc/misc/gnus.texi
index 424e15bc6d1..718e269fc86 100644
--- a/doc/misc/gnus.texi
+++ b/doc/misc/gnus.texi
@@ -25668,6 +25668,13 @@ Create non-spam statistics for every file in this directory. Every
file is treated as one non-spam mail.
@end defun
+@defvar spam-stat-process-directory-age
+Maximum age of files to be processed, in days. Without this filter,
+re-training spam-stat with several thousand messages could take a long
+time. The default is 90, but you might want to set this to a bigger
+value during the initial training.
+@end defvar
+
Usually you would call @code{spam-stat-process-spam-directory} on a
directory such as @file{~/Mail/mail/spam} (this usually corresponds to
the group @samp{nnml:mail.spam}), and you would call