diff --git a/lisp/ob-python.el b/lisp/ob-python.el
index 1829ab149..897462a2a 100644
--- a/lisp/ob-python.el
+++ b/lisp/ob-python.el
@@ -52,6 +52,7 @@
   :group 'org-babel
   :type 'string)
 
+;; FIXME: Remove third-party `python-mode' package support in the next release.
 (defcustom org-babel-python-mode
   (if (featurep 'python-mode) 'python-mode 'python)
   "Preferred python mode for use in running python interactively.