diff --git a/app/changelog/page.mdx b/app/changelog/page.mdx
index eaec9a9..0bc13f7 100644
--- a/app/changelog/page.mdx
+++ b/app/changelog/page.mdx
@@ -11,6 +11,7 @@ This page lists changes since Working Draft 3. {{ className: 'lead' }}
 ## Since WD 4
 
 - Removed URI from [Report](/extensions/reports), and replaced `reason` with `tags`.
+- Mandated Unix-style `\n` line endings in all text fields.
 
 ## Since WD 3
 
diff --git a/app/entities/page.mdx b/app/entities/page.mdx
index fb036a2..2bad0d5 100644
--- a/app/entities/page.mdx
+++ b/app/entities/page.mdx
@@ -79,7 +79,8 @@ Any field in an entity not marked as `required` may be omitted or set to `null`.
 
 ## Serialization
 
-When serialized to a string, the JSON representation of an entity should follow the following rules:
+When serialized to a string, the JSON representation of an entity must follow the following rules:
 - Keys must be sorted lexicographically.
-- Should use UTF-8 encoding.
+- Must use UTF-8 encoding.
 - Must be **signed** using the relevant [User](/entities/user)'s private key, or the [instance's private key](/entities/instance-metadata) if the entity is not associated with a particular user.
+- Must use Unix-style `\n` line endings (LF).
\ No newline at end of file