* lisp/emacs-lisp/package-vc.el: Expand commentary

diff --git a/lisp/emacs-lisp/package-vc.el b/lisp/emacs-lisp/package-vc.el
index 4a9c1685330ea9177981a130e636848bbc2dd911..a19bbb19881a525b1bcc6ee583c118e360c75d3a 100644 (file)
--- a/lisp/emacs-lisp/package-vc.el
+++ b/lisp/emacs-lisp/package-vc.el
@@ -23,6 +23,17 @@
 ;; While packages managed by package.el use tarballs for distributing
 ;; the source code, this extension allows for packages to be fetched
 ;; and updated directly from a version control system.
+;;
+;; To install a package from source use `package-vc-install'.  If you
+;; aren't interested in activating a package, you can use
+;; `package-vc-checkout' instead, which will prompt you for a target
+;; directory.  If you wish to re-use an existing checkout, the command
+;; `package-vc-link-directory' will create a symbolic link and prepare
+;; the package.
+;;
+;; If you make local changes that you wish to share with an upstream
+;; maintainer, the command `package-vc-prepare-patch' can prepare
+;; these as patches to send via Email.
 
 ;;; TODO: