Document what the `t' value for HIST in `read-string' means

* src/minibuf.c (syms_of_minibuf): Say that `t' means "no history"
(bug#36324).
(Fread_from_minibuffer): Say the same for HIST.

diff --git a/src/minibuf.c b/src/minibuf.c
index 2bf6bc259466a7b3acc6d9d2c87ad6d2b112e03d..d932dbe8e208e385e55aa640857107bf8ba3bca0 100644 (file)
--- a/src/minibuf.c
+++ b/src/minibuf.c
@@ -875,7 +875,8 @@ Fifth arg HIST, if non-nil, specifies a history list and optionally
   HISTPOS is the initial position for use by the minibuffer history
   commands.  For consistency, you should also specify that element of
   the history as the value of INITIAL-CONTENTS.  Positions are counted
-  starting from 1 at the beginning of the list.
+  starting from 1 at the beginning of the list.  If HIST is the symbol
+  `t', history is not recorded.
 
 Sixth arg DEFAULT-VALUE, if non-nil, should be a string, which is used
   as the default to `read' if READ is non-nil and the user enters
@@ -2037,8 +2038,11 @@ If the value is `confirm-after-completion', the user may exit with an
               doc: /* History list symbol to add minibuffer values to.
 Each string of minibuffer input, as it appears on exit from the minibuffer,
 is added with
+
   (set minibuffer-history-variable
-  (cons STRING (symbol-value minibuffer-history-variable)))  */);
+       (cons STRING (symbol-value minibuffer-history-variable)))
+
+ If the variable is the symbol `t', no history is recorded.  */);
   XSETFASTINT (Vminibuffer_history_variable, 0);
 
   DEFVAR_LISP ("minibuffer-history-position", Vminibuffer_history_position,