diff --git a/lisp/tab-bar.el b/lisp/tab-bar.el
index 3401b796cac..58d2ef650a1 100644
--- a/lisp/tab-bar.el
+++ b/lisp/tab-bar.el
@@ -1456,10 +1456,18 @@ tab-bar-select-restore-windows
   "Function called when selecting a tab to handle windows whose buffer was killed.
 When a tab-bar tab displays a window whose buffer was killed since
 this tab was last selected, this function determines what to do with
-that window.  By default, either a random buffer is displayed instead of
-the killed buffer, or the window gets deleted.  However, with the help
-of `window-restore-killed-buffer-windows' it's possible to handle such
-situations better by displaying an information about the killed buffer."
+that window.  By default, a placeholder buffer is displayed in that
+window to give the user information about the killed buffer; this
+option can also be set to:
+
+ * nil:        no special handling; `set-window-configuration' will
+               decide what to do with the window, e.g. make it display
+               another buffer;
+
+ * a function: display another buffer in that window, and pass that
+               buffer to the function.  See
+               `window-restore-killed-buffer-windows' for the calling
+               convention."
   :type '(choice (const :tag "No special handling" nil)
                  (const :tag "Show placeholder buffers"
                         tab-bar-select-restore-windows)