diff --git a/content/en/functions/union.md b/content/en/functions/union.md
index 5c93e4bc7..db3c14283 100644
--- a/content/en/functions/union.md
+++ b/content/en/functions/union.md
@@ -35,6 +35,7 @@ Given two arrays (or slices) A and B, this function will return a new array that
 <!-- returns an error because both arrays/slices have to be of the same type -->
 ```
 
+## OR filter in where query
 
 This is also very useful to use as `OR` filters when combined with where: