diff --git a/markdown/design/element-sink.md b/markdown/design/element-sink.md
index 9e6f31def0..1de9e0a36e 100644
--- a/markdown/design/element-sink.md
+++ b/markdown/design/element-sink.md
@@ -30,7 +30,7 @@ Events other than EOS do not complete the preroll stage.
 
 ## sink overview
 
-  - TODO: PREROLL\_LOCK can be removed and we can safely use the STREAM\_LOCK.
+  - TODO: `PREROLL_LOCK` can be removed and we can safely use the `STREAM_LOCK`.
 
 ``````
   # Commit the state. We return TRUE if we can continue