diff --git a/tdns/README.md b/tdns/README.md
index 6411ac0..c55646e 100644
--- a/tdns/README.md
+++ b/tdns/README.md
@@ -168,7 +168,7 @@ The DNS Tree is of fundamental importance, and is used a number of times
 within `tdns`.
 
 When storing the contents of the `org` zone, it may look like this:
-
+```
 *************************************************************************************************
 *                                                                                               *
 *                                   .---.                                                       *
@@ -189,6 +189,7 @@ When storing the contents of the `org` zone, it may look like this:
 *               '-+-'    '---'                                                                  *                   
 *                                                                                               *
 *************************************************************************************************
+```
 
 This tree has a depth of four. The top node has an empty name, and is
 relative to the name of the zone, in this case `org`.
@@ -725,4 +726,4 @@ time.powerdns.org.	3600	IN	TXT	"The time is Fri, 13 Apr 2018 12:55:54 +0200"
 window.markdeepOptions={};
 window.markdeepOptions.tocStyle = "long";
 </script>
-<!-- Markdeep: --><style class="fallback">body{visibility:hidden;white-space:pre;font-family:monospace}</style><script src="../ext/markdeep.min.js"></script><script>window.alreadyProcessedMarkdeep||(document.body.style.visibility="visible")</script>
\ No newline at end of file
+<!-- Markdeep: --><style class="fallback">body{visibility:hidden;white-space:pre;font-family:monospace}</style><script src="../ext/markdeep.min.js"></script><script>window.alreadyProcessedMarkdeep||(document.body.style.visibility="visible")</script>