2 files changed, 9 insertions, 1 deletions

diff --git a/lisp/textmodes/reftex-vars.el b/lisp/textmodes/reftex-vars.el
index c00cf36c79e..a220002286e 100644
--- a/lisp/textmodes/reftex-vars.el
+++ b/lisp/textmodes/reftex-vars.el
@@ -873,7 +873,14 @@ DOWNCASE    t:   Downcase words before using them."
 The default value matches usual \\label{...} definitions and
 keyval style [..., label = {...}, ...] label definitions.  It is
 assumed that the regexp group 1 matches the label text, so you
-have to define it using \\(?1:...\\) when adding new regexps."
+have to define it using \\(?1:...\\) when adding new regexps.
+
+When changed from Lisp, make sure to call
+`reftex-compile-variables' afterwards to make the change
+effective."
+  :set (lambda (symbol value)
+         (set symbol value)
+         (reftex-compile-variables))
   :group 'reftex-defining-label-environments
   :type '(repeat (regexp :tag "Regular Expression")))
 
diff --git a/lisp/textmodes/reftex.el b/lisp/textmodes/reftex.el
index 21083fd188a..8b5dee5a037 100644
--- a/lisp/textmodes/reftex.el
+++ b/lisp/textmodes/reftex.el
@@ -811,6 +811,7 @@ This enforces rescanning the buffer on next use."
      (reftex-kill-buffer (reftex-make-index-buffer-name tag)))
    (cdr (assoc 'index-tags (symbol-value reftex-docstruct-symbol)))))
 
+;;;###autoload
 (defun reftex-compile-variables ()
   ;; Compile the information in reftex-label-alist & Co.