diff --git a/doc/POST_INSTALL.md b/doc/POST_INSTALL.md
index 36f24cb..ec548e7 100644
--- a/doc/POST_INSTALL.md
+++ b/doc/POST_INSTALL.md
@@ -1,5 +1,7 @@
 For testing we can use Trickle-Ice testing tool. Go to trickle-ice page https://webrtc.github.io/samples/src/content/peerconnection/trickle-ice/ and enter following details.
 
+```
 STUN or TURN URI: turn:__DOMAIN__:__PORT_TURNSERVER_TLS__
 TURN username:    turnserver
 TURN password:    __TURNSERVER_PWD__
+```