diff --git a/README.md b/README.md
index 1c6282d..9c867c2 100644
--- a/README.md
+++ b/README.md
@@ -12,6 +12,12 @@ makes our life a bit easier when setting global `$TYPO3_CONF_VARS` settings,
 which usually takes place in LocalConfiguration, AdditionalConfiguration
 and the extensions' `ext_localconf.php` files.
 
+### Note using TYPO3 v12
+
+The configuration files LocalConfiguration and AdditionalConfiguration
+have been moved and renamed, s.
+[Configuration files](https://docs.typo3.org/m/typo3/reference-coreapi/main/en-us/Configuration/ConfigurationFiles.html)
+
 ### Reason 1: We want context-dependent config files
 
 With our configuration class, TYPO3's "AdditionalConfiguration"
diff --git a/composer.json b/composer.json
index 1a56bdb..5d81435 100644
--- a/composer.json
+++ b/composer.json
@@ -4,7 +4,7 @@
   "license": "GPL-2.0+",
   "require": {
     "php": "^7.2 || ~8.0",
-    "typo3/cms-core": "^9.5.14 || ^10.0.0 || ^11.0.0"
+    "typo3/cms-core": "^9.5.14 || ^10.0.0 || ^11.0.0 || ^12.0.0"
   },
   "autoload": {
     "classmap": ["src/"]