diff --git a/build/generate-pocketmine-yml-property-consts.php b/build/generate-pocketmine-yml-property-consts.php
index 23d1de04a86..90342a75fc2 100644
--- a/build/generate-pocketmine-yml-property-consts.php
+++ b/build/generate-pocketmine-yml-property-consts.php
@@ -90,6 +90,16 @@ function collectProperties(string $prefix, array $properties, array &$constants)
 fwrite($file, "declare(strict_types=1);\n\n");
 fwrite($file, "namespace pocketmine;\n\n");
 
+fwrite($file, <<<'DOC'
+/**
+ * @internal
+ * Constants for all properties available in pocketmine.yml.
+ * This is generated by build/generate-pocketmine-yml-property-consts.php.
+ * Do not edit this file manually.
+ */
+
+DOC
+);
 fwrite($file, "final class YmlServerProperties{\n");
 foreach(Utils::stringifyKeys($constants) as $constName => $propertyName){
 	fwrite($file, "\tpublic const $constName = '$propertyName';\n");
diff --git a/src/ServerProperties.php b/src/ServerProperties.php
index 884ff4f67f7..aad26d2424f 100644
--- a/src/ServerProperties.php
+++ b/src/ServerProperties.php
@@ -23,6 +23,10 @@
 
 namespace pocketmine;
 
+/**
+ * @internal
+ * Constants for all properties available in server.properties.
+ */
 final class ServerProperties{
 
 	public const AUTO_SAVE = "auto-save";
diff --git a/src/YmlServerProperties.php b/src/YmlServerProperties.php
index 920f0797add..7d088b13c3e 100644
--- a/src/YmlServerProperties.php
+++ b/src/YmlServerProperties.php
@@ -23,6 +23,12 @@
 
 namespace pocketmine;
 
+/**
+ * @internal
+ * Constants for all properties available in pocketmine.yml.
+ * This is generated by build/generate-pocketmine-yml-property-consts.php.
+ * Do not edit this file manually.
+ */
 final class YmlServerProperties{
 	public const ALIASES = 'aliases';
 	public const ANONYMOUS_STATISTICS = 'anonymous-statistics';