diff --git a/app/changelog/page.mdx b/app/changelog/page.mdx
index 70a0db6..2bdb596 100644
--- a/app/changelog/page.mdx
+++ b/app/changelog/page.mdx
@@ -26,6 +26,8 @@ This page lists changes since Working Draft 3. {{ className: 'lead' }}
     - Changed all Collections that can contain remote entities to use URI Collections (eg. [User](/entities/user) `collections.followers`).
 - Add `collections` field to [Notes](/entities/note).
     - [Likes Extension](/extensions/likes), [Reactions Extension](/extensions/reactions) and [Share Extension](/extensions/share) now use this field, instead of a custom field in `extensions`.
+- Allowed uppercase characters in [User](/entities/user) `username`.
+    - These are now case-insensitive.
 
 ## Since WD 3
 
diff --git a/app/entities/user/page.mdx b/app/entities/user/page.mdx
index bb4773d..9330692 100644
--- a/app/entities/user/page.mdx
+++ b/app/entities/user/page.mdx
@@ -23,7 +23,7 @@ For example:
 @018ec082-0ae1-761c-b2c5-22275a611771@versia.social
 ```
 
-This is similar to an email address or an ActivityPub address.
+This is similar to an email address or an ActivityPub address. Usernames are case-insensitive.
 
 ### Identifier
 
@@ -65,7 +65,7 @@ Instance **must** be the host of the instance the user is on (hostname with opti
         <Property name="username" type="string" required={true}>
             Alpha-numeric username. Must be unique within the instance. **Must** be treated as changeable by the user.
 
-            Can only contain the following characters: `a-z` (lowercase), `0-9`, `_` and `-`. Should be limited to reasonable lengths.
+            Can only contain the following characters: `a-z`, `A-Z` (case-insensitive), `0-9`, `_` and `-`. Should be limited to reasonable lengths.
         </Property>
         <Property name="header" type="ContentFormat" required={false} typeLink="/structures/content-format">
             A header image for the user's profile. Also known as a cover photo or a banner. Must be an image format (`image/*`).