diff --git a/docs/labs.md b/docs/labs.md
index ae2c72a488..1561021403 100644
--- a/docs/labs.md
+++ b/docs/labs.md
@@ -49,3 +49,11 @@ That's it. Now should see your new counter under the header.
 ## Multiple integration managers (`feature_many_integration_managers`)
 
 Exposes a way to access all the integration managers known to Riot. This is an implementation of [MSC1957](https://github.com/matrix-org/matrix-doc/pull/1957).
+
+## Event indexing or E2EE search support using Seshat (`feature_event_indexing`)
+
+Adds support for search in E2E encrypted rooms. This enables an event indexer
+that downloads, stores, and indexes room messages for E2E encrypted rooms.
+
+The existing search will transparently work for encrypted rooms just like it
+does for non-encrypted.