diff --git a/25.md b/25.md
index 0fb2af1..8efd718 100644
--- a/25.md
+++ b/25.md
@@ -7,8 +7,10 @@ Reactions
 
 `draft` `optional`
 
-A reaction is a `kind 7` event that is used to react to other events. A reaction's `content` field
-MUST include a single character indicating the value of the reaction.
+A reaction is a `kind 7` event that is used to indicate user reactions to other events. A
+reaction's `content` field MUST include a single character indicating the value of the reaction.
+Reactions MUST NOT be used to support application-level semantics, they are for user-generated
+content only.
 
 A reaction with `content` set to `+` or an empty string MUST be interpreted as a "like" or "upvote".
 A reaction with `content` set to `-` MUST be interpreted as a "dislike" or "downvote".