diff --git a/api/g3doc/threading_design.md b/api/g3doc/threading_design.md
index 868c433abc..20c3539b22 100644
--- a/api/g3doc/threading_design.md
+++ b/api/g3doc/threading_design.md
@@ -37,7 +37,7 @@ and sequenced task queues.
 At the moment, the API does not give any guarantee on which thread* the
 callbacks and events are called on. So it's best to write all callback
 and event handlers like this (pseudocode):
-<pre>
+```
 void ObserverClass::Handler(event) {
   if (!called_on_client_thread()) {
     dispatch_to_client_thread(bind(handler(event)));
@@ -45,7 +45,7 @@ void ObserverClass::Handler(event) {
   }
   // Process event, we're now on the right thread
 }
-</pre>
+```
 In the future, the implementation may change to always call the callbacks
 and event handlers on the client thread.