diff --git a/.emacs.d/lisp/main.el b/.emacs.d/lisp/main.el
index 2e6f8166..af3e9363 100644
--- a/.emacs.d/lisp/main.el
+++ b/.emacs.d/lisp/main.el
@@ -168,6 +168,8 @@
   ;; TODO: Use eww instead of w3m.  For some reason it hangs for almost a minute
   ;; with eww.
   (setq browse-url-browser-function '(("file:///.*/gtk-doc/html/.*" . w3m-browse-url)
+                                      ;; TODO: Display hyperspec in other window.
+                                      ("http://www.lispworks.com/reference/HyperSpec/.*" . eww-browse-url)
                                       ("." . browse-url-default-browser))))
 
 ;; shr