Add comment to eieio-opt about why we're requiring cl-extra

* lisp/emacs-lisp/eieio-opt.el (cl-extra): Add comment about why
we're not requiring cl-lib.

diff --git a/lisp/emacs-lisp/eieio-opt.el b/lisp/emacs-lisp/eieio-opt.el
index ae99e4ec6f613e51b7cab43c8fe6198c8da4aeea..f08c1de936bac8ae23012069ef5f2e0a83c84d71 100644 (file)
--- a/lisp/emacs-lisp/eieio-opt.el
+++ b/lisp/emacs-lisp/eieio-opt.el
@@ -31,6 +31,9 @@
 (require 'eieio)
 (require 'find-func)
 (require 'speedbar)
+
+;; We require cl-extra here instead of cl-lib because we need the
+;; internal `cl--describe-class' function.
 (require 'cl-extra)
 
 ;;; Code: