diff --git a/w3-index.md b/w3-index.md
index 3003ad5..1a8cdb2 100644
--- a/w3-index.md
+++ b/w3-index.md
@@ -58,6 +58,8 @@ type ContentArchive<T> = ByteView<{
 }>
 ```
 
+An invocation of the capability SHOULD include a temporary delegation to the service allowing the index in the space to be retrieved from the network so that it may be indexed and cached. See the [w3-retrieval](w3-retrieval.md) specification for details.
+
 ### Index
 
 #### Index Schema