diff --git a/files/en-us/web/css/@container/index.md b/files/en-us/web/css/@container/index.md
index 4ef7e482072cc7f..8b925d2c85574e4 100644
--- a/files/en-us/web/css/@container/index.md
+++ b/files/en-us/web/css/@container/index.md
@@ -127,7 +127,7 @@ The `<container-condition>` queries include [size](#size_container_descriptors)
 
 #### Size container descriptors
 
-The `<container-condition>` can include one or more boolean size queries, each within a set of parentheses. A size query includes a size descriptor, a value, and — depending on the descriptor — a comparison operator. The syntax for including multiple conditions is the same as for [`@media`](/en-US/docs/Web/CSS/@media) size feature queries.
+The `<container-condition>` can include one or more boolean size queries, each within a set of parentheses. A size query includes a size descriptor, a value, and — depending on the descriptor — a comparison operator. The queries always measures the [content box](/en-US/docs/Web/CSS/box-edge#content-box) as the comparison. The syntax for including multiple conditions is the same as for [`@media`](/en-US/docs/Web/CSS/@media) size feature queries.
 
 ```css
 @container (min-width: 400px) {