diff --git a/50.md b/50.md
index 08ce4fd2..396c1f9a 100644
--- a/50.md
+++ b/50.md
@@ -53,3 +53,4 @@ Relay MAY support these extensions:
 - `language:<two letter ISO 639-1 language code>` - include only events of a specified language
 - `sentiment:<negative/neutral/positive>` - include only events of a specific sentiment
 - `nsfw:<true/false>` - include or exclude nsfw events (default: true)
+- `autocomplete:<true/false>` - match the query as a prefix against short, name-shaped fields (e.g. profile `name`/`display_name`/`nip05`, channel `name`, `title` tags) instead of full-text content, suitable for typeahead/autocomplete UIs