diff --git a/50.md b/50.md
index 5bda355..05e32ef 100644
--- a/50.md
+++ b/50.md
@@ -43,6 +43,8 @@ client's use case, and MAY stop querying relays that have low precision.
 
 Relays SHOULD exclude spam from search results by default if they supports some form of spam filtering.
 
+Relays MAY only use `search` filter when searching for persisted events and ignore when sending new events because some extensions may not be compatible with real-time processing (it may require time to mark event as a spam for example). However relays SHOULD send events matched by `search` filters after `EOSE` as accurately as possible.
+
 ## Extensions
 
 Relay MAY support these extensions: