1 files changed, 5 insertions, 1 deletions

diff --git a/50.md b/50.md
index 6603303..a3fcf87 100644
--- a/50.md
+++ b/50.md
@@ -47,4 +47,8 @@ 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
+- `domain:<domain>` - include only events from users whose valid nip05 domain matches the domain
+- `topic:<topic>` - include only events within a classified topic (short string, one to two words)
+- `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)