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diff --git a/lib/doc/jao-doc-session.el b/lib/doc/jao-doc-session.el
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+;;; jao-doc-session.el --- persistent document sessions  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2022, 2024  jao
+
+;; Author: jao <mail@jao.io>
+;; Keywords: docs
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Code:
+
+(persist-defvar jao-doc-session nil "Documents session")
+
+(defvar-local jao-doc-session--is-doc nil)
+
+(defun jao-doc-session-is-doc (&optional buffer)
+  "Check whether the given or current buffer belong to the doc session."
+  (buffer-local-value 'jao-doc-session--is-doc (or buffer (current-buffer))))
+
+(defun jao-doc-session (&optional file) jao-doc-session)
+
+(defun jao-doc-session-save (&optional skip-current force)
+  "Traverse all current buffers and update the value of `jao-doc-session'."
+  (interactive)
+  (let ((docs '())
+        (cb (and skip-current (current-buffer))))
+    (dolist (b (buffer-list))
+      (when-let (fs (and (not (eq cb b)) (jao-doc-session-is-doc b)))
+        (dolist (f fs) (add-to-list 'docs f))))
+    (when (or force (> (length docs) 0))
+      (setq jao-doc-session docs))))
+
+(defun jao-doc-session-mark (&optional path)
+  "Mark the current buffer's file, or PATH, as persistent across sessions."
+  (unless (listp jao-doc-session--is-doc)
+    (setq jao-doc-session--is-doc (ensure-list jao-doc-session--is-doc)))
+  (cl-pushnew (or path (buffer-file-name)) jao-doc-session--is-doc)
+  (jao-doc-session-save))
+
+(defun jao-doc-session--maybe-save ()
+  (when (jao-doc-session-is-doc) (jao-doc-session-save t)))
+
+(defvar jao-doc-session-inhibit-save nil)
+
+(add-hook 'kill-buffer-hook #'jao-doc-session--maybe-save)
+
+(provide 'jao-doc-session)
+;;; jao-doc-session.el ends here