diff --git a/Distributed_Systems/site_reliability_engineering.md b/Distributed_Systems/site_reliability_engineering.md
index e5a365a..3062dc7 100644
--- a/Distributed_Systems/site_reliability_engineering.md
+++ b/Distributed_Systems/site_reliability_engineering.md
@@ -36,7 +36,7 @@
 ## Dev Environment
 [Mor12b] and [Pot16]
 
-[//] # Reference
+[//]: # Reference
 
 [Bur06]: http://research.google.com/archive/chubby-osdi06.pdf
 [Bur16]: https://research.google/pubs/pub44843.pdf