diff --git a/content/en/entities/Instance.md b/content/en/entities/Instance.md
index 11c48188..1373c754 100644
--- a/content/en/entities/Instance.md
+++ b/content/en/entities/Instance.md
@@ -121,6 +121,7 @@ aliases: [
   "registrations": {
     "enabled": false,
     "approval_required": false,
+    "reason_required": false,
     "message": null,
     "min_age": 16
   },
@@ -519,6 +520,13 @@ aliases: [
 **Version history:**\
 4.4.0 - added
 
+#### `registrations[reason_required]` #{registrations-reason_required}
+
+**Description:** Whether registrations require the user to provide a reason for joining. Only applicable when `registrations[approval_required]` is true.\
+**Type:** {{<nullable>}} Boolean\
+**Version history:**\
+4.4.0 - added
+
 ### `api_versions` {#api-versions}
 
 **Description:** Information about which version of the API is implemented by this server. It contains at least a `mastodon` attribute, and other implementations may have their own additional attributes.\