Add lowercase convention

61.md

@@ -10,7 +10,7 @@ An unbound list is a group of events with the same pubkey and `n` (list "n"ame)
 An event can have many `n` tags, thus being member of many unbound lists.
 
 To add an event to the "Close Friends" list,
-add a "close-friend" (prefer singular form with dash separator) `n` tag to the event.
+add a "close-friend" (prefer lowercase English words in singular form with dash separator) `n` tag to the event.
 
 To remove an event from a "Close Friends" list,
 remove the "close-friend" `n` tag from the event.