save-some-buffers-default-predicate doc clarification

* lisp/files.el (save-some-buffers-default-predicate): Clarify
calling convention.

1 files changed, 5 insertions, 1 deletions

diff --git a/lisp/files.el b/lisp/files.el
index 009f52a3c68..f76635017d5 100644
--- a/lisp/files.el
+++ b/lisp/files.el
@@ -5425,8 +5425,12 @@ Before and after saving the buffer, this function runs
 
 (defcustom save-some-buffers-default-predicate nil
   "Default predicate for `save-some-buffers'.
+
 This allows you to stop `save-some-buffers' from asking
-about certain files that you'd usually rather not save."
+about certain files that you'd usually rather not save.
+
+This function is called (with no parameters) from the buffer to
+be saved."
   :group 'auto-save
   ;; FIXME nil should not be a valid option, let alone the default,
   ;; eg so that add-function can be used.