diff --git a/README.md b/README.md
index e4caac4f227d331b92e5dfb78fba499d2302d22e..6625a30ef7ef208cdeb37e9ebcbcd0b2b670d248 100644
--- a/README.md
+++ b/README.md
@@ -90,5 +90,5 @@ As last step, we take a screenshot of the displayed windows, which is the output
 [3rd-repo-debwiki]:https://wiki.debian.org/DebianRepository/UseThirdParty#Instructions_to_connect_to_a_third-party_repository
 [3rd-repo-se]:https://unix.stackexchange.com/questions/332672/how-to-add-a-third-party-repo-and-key-in-debian
 [3rd-repo-lu]:https://www.linuxuprising.com/2021/01/apt-key-is-deprecated-how-to-add.html
-[narnold-xle]:#
+[narnold-xle]:https://www.cl.uni-heidelberg.de/~narnold/xle/posts/2021-05-25-syntax-xle-mad.html
 [screenshot]:https://unix.stackexchange.com/questions/365268/how-do-i-take-a-screen-shot-of-my-xvfb-buffer