1 files changed, 1 insertions, 0 deletions

diff --git a/50.md b/50.md
index 9d1a54c..6603303 100644
--- a/50.md
+++ b/50.md
@@ -47,3 +47,4 @@ Relays SHOULD exclude spam from search results by default if they support some f
 
 Relay MAY support these extensions:
 - `include:spam` - turn off spam filtering, if it was enabled by default
+- `domain:<domain>` - include events from users whose valid nip05 domain matches the domain