Document the required `minversion` attribute

diff --git a/docs/migration/wsc55/php.md b/docs/migration/wsc55/php.md
index 80a9a7a34fc1284c580861bb556542a45b9834c2..3a94eb189e2aa2934300598b9f385261c931bbcd 100644 (file)
--- a/docs/migration/wsc55/php.md
+++ b/docs/migration/wsc55/php.md
@@ -64,6 +64,10 @@ Instead they must retrieve the appropriate information from the event data only.
 
 ## Package System
 
+### Required “minversion” for required packages
+
+The `minversion` attribute of the `<requiredpackage>` tag is now required.
+
 ### Rejection of “pl” versions
 
 Woltlab Suite 6.0 no longer accepts package versions with the “pl” suffix as valid.