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-rw-r--r--lisp/emacs-lisp/seq.el8
1 files changed, 5 insertions, 3 deletions
diff --git a/lisp/emacs-lisp/seq.el b/lisp/emacs-lisp/seq.el
index e3037a71901..42b145da2fd 100644
--- a/lisp/emacs-lisp/seq.el
+++ b/lisp/emacs-lisp/seq.el
@@ -336,9 +336,11 @@ list."
"Reduce the function FUNCTION across SEQUENCE, starting with INITIAL-VALUE.
Return the result of calling FUNCTION with INITIAL-VALUE and the
-first element of SEQUENCE, then calling FUNCTION with that result and
-the second element of SEQUENCE, then with that result and the third
-element of SEQUENCE, etc.
+first element of SEQUENCE, then calling FUNCTION with that result
+and the second element of SEQUENCE, then with that result and the
+third element of SEQUENCE, etc. FUNCTION will be called with
+INITIAL-VALUE (and then the accumulated value) as the first
+argument, and the elements from SEQUENCE as the second argument.
If SEQUENCE is empty, return INITIAL-VALUE and FUNCTION is not called."
(if (seq-empty-p sequence)