diff --git a/112.md b/112.md
index 19a6fea..0a90db0 100644
--- a/112.md
+++ b/112.md
@@ -231,7 +231,7 @@ The owner of a channel can add a "expiration" tag to the channel creation messag
 
 The owner of a channel who adds a "expiration" tag SHOULD issue a 404 message before the expiration.   
 
-All members of a channel SHOULD also adding a NIP-40 "expiration" tag to all messages sent to the channel using the duration (`expiration - created_at`) of the wrapped-400 create.
+All members of a channel SHOULD also add a NIP-40 "expiration" tag to all messages sent to the channel using the duration (`expiration - created_at`) of the wrapped-400 create.
 
 Members of a channel MUST NOT send new messages if a 404 message has not been received before expiration.