diff --git a/standards/application/waku-api.md b/standards/application/waku-api.md
index 9cc412c..7eaf329 100644
--- a/standards/application/waku-api.md
+++ b/standards/application/waku-api.md
@@ -338,7 +338,7 @@ although performance or reliability may be impacted.
 `Healthy` indicates that the node is operating optimally,
 with full support for message processing and transmission.
 
-## Event source
+## Event Source
 
 #### Type definitions