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-rw-r--r--man/files.texi4
1 files changed, 3 insertions, 1 deletions
diff --git a/man/files.texi b/man/files.texi
index df35f996a6b..7d952d13126 100644
--- a/man/files.texi
+++ b/man/files.texi
@@ -980,7 +980,9 @@ zero or negative argument; with no argument, it toggles.
Emacs does auto-saving periodically based on counting how many characters
you have typed since the last time auto-saving was done. The variable
@code{auto-save-interval} specifies how many characters there are between
-auto-saves. By default, it is 300.
+auto-saves. By default, it is 300. Emacs doesn't accept values that are
+too small: if you customize @code{auto-save-interval} to a value less
+than 20, Emacs will behave as if the value is 20.
@vindex auto-save-timeout
Auto-saving also takes place when you stop typing for a while. The