Clarify doc string of cl-pushnew

* lisp/emacs-lisp/cl-lib.el (cl-pushnew): Clarify doc string
(bug#37016).

1 files changed, 6 insertions, 3 deletions

diff --git a/lisp/emacs-lisp/cl-lib.el b/lisp/emacs-lisp/cl-lib.el
index 7b22fa8483a..fceabf8c2e3 100644
--- a/lisp/emacs-lisp/cl-lib.el
+++ b/lisp/emacs-lisp/cl-lib.el
@@ -129,9 +129,12 @@ The return value is the decremented value of PLACE."
     (list 'cl-callf '- place (or x 1))))
 
 (defmacro cl-pushnew (x place &rest keys)
-  "(cl-pushnew X PLACE): insert X at the head of the list if not already there.
-Like (push X PLACE), except that the list is unmodified if X is `eql' to
-an element already on the list.
+  "Add X to the list stored in PLACE unless already X is already in the list.
+PLACE is a generalized variable that stores a list.
+
+Like (push X PLACE), except that PLACE is unmodified if X is
+`eql' to an element already in PLACE list.
+
 \nKeywords supported:  :test :test-not :key
 \n(fn X PLACE [KEYWORD VALUE]...)"
   (declare (debug