diff --git a/src/FieldOfApplication.php b/src/FieldOfApplication.php
index 4c77b7f..d6511bf 100644
--- a/src/FieldOfApplication.php
+++ b/src/FieldOfApplication.php
@@ -36,7 +36,7 @@ final class FieldOfApplication extends Enum
 
 	public const PERSONAL_DEVELOPMENT = 'personal-development';
 
-	public const MARGETING = 'margeting';
+	public const MARKETING = 'marketing';
 
 	public const NON_PROFIT = 'non-profit';
 
diff --git a/tools/cs/ruleset.xml b/tools/cs/ruleset.xml
index d97c294..26230f7 100644
--- a/tools/cs/ruleset.xml
+++ b/tools/cs/ruleset.xml
@@ -50,11 +50,13 @@
 			<property name="searchAnnotations" type="boolean" value="true"/>
 		</properties>
 	</rule>
-	<rule ref="SlevomatCodingStandard.Files.TypeNameMatchesFileName">
-		<properties>
-			<property name="rootNamespaces" type="array" value="libs/SmartSelling=>SmartSelling"/>
-		</properties>
-	</rule>
+    <rule ref="SlevomatCodingStandard.Files.TypeNameMatchesFileName">
+        <properties>
+            <property name="rootNamespaces" type="array">
+                <element key="libs/SmartSelling" value="SmartSelling"/>
+            </property>
+        </properties>
+    </rule>
 	<rule ref="SlevomatCodingStandard.Namespaces.ReferenceUsedNamesOnly">
 		<properties>
 			<property name="allowFullyQualifiedExceptions" type="boolean" value="true"/>