diff --git a/27.md b/27.md
index 1b1a9372..d8a236e0 100644
--- a/27.md
+++ b/27.md
@@ -18,7 +18,8 @@ of an `m` tag is case-sensitive.
 A client SHOULD send events containing `m` tags only to relays that explicitly
 support NIP-27. A NIP-16 supporting client MAY test for the capability by
 subscribing twice to a relay with and without the tag filter `#m` respectively
-and sending an ephemeral event with a random `m` tag of equal value.
+and sending an ephemeral event with a random `m` tag of equal value and assert
+it was only received by the right subscription.
 
 ## Events
 
@@ -29,7 +30,7 @@ Suppose that Alice wants to multicast an event to a very special multicast group
 that covers specific topics. The multicast group is identified by the following
 string: `00000000839a8e6886ab5951d76f411475428afc90947ee320161bbf18eb6048`
 
-Alice would construct the following message and sends it to her favorite relay
+Alice would construct the following message and send it to her favorite relay
 which happens to support multicasting:
 
 ```json
@@ -56,7 +57,7 @@ an array of multicast groups as values.
 Suppose that Bob and Charlie both share Alice's interest and would like to stay
 up to date. Both would construct the following message to subscribe:
 
-```
+```json
 [
   "REQ",
   "<subscriptionId>",