diff --git a/composer.json b/composer.json
index f10026ad8..b45b9c57f 100644
--- a/composer.json
+++ b/composer.json
@@ -4,7 +4,7 @@
 		"mediawiki/mediawiki-codesniffer": "28.0.0",
 		"jakub-onderka/php-console-highlighter": "0.3.2",
 		"mediawiki/minus-x": "0.3.1",
-		"mediawiki/mediawiki-phan-config": "0.6.1"
+		"mediawiki/mediawiki-phan-config": "0.8.0"
 	},
 	"scripts": {
 		"test": [
diff --git a/src/MathMathML.php b/src/MathMathML.php
index 408623ac2..840eb3535 100644
--- a/src/MathMathML.php
+++ b/src/MathMathML.php
@@ -30,6 +30,7 @@ class MathMathML extends MathRenderer {
 	/** @var string|bool */
 	private $pngPath = false;
 
+	/** @var string|null */
 	private $mathoidStyle;
 
 	public function __construct( $tex = '', $params = [] ) {
@@ -66,6 +67,9 @@ class MathMathML extends MathRenderer {
 		}
 	}
 
+	/**
+	 * @param array[] $tags
+	 */
 	public static function batchEvaluate( array $tags ) {
 		$rbis = [];
 		foreach ( $tags as $key => $tag ) {
diff --git a/src/MathRestbaseInterface.php b/src/MathRestbaseInterface.php
index 8d190fa32..c11d69c16 100644
--- a/src/MathRestbaseInterface.php
+++ b/src/MathRestbaseInterface.php
@@ -405,7 +405,7 @@ class MathRestbaseInterface {
 	}
 
 	/**
-	 * @return mixed
+	 * @return string
 	 */
 	public function getMathoidStyle() {
 		return $this->mathoidStyle;