diff --git a/.gitignore b/.gitignore
index 485dee64bcfb48793379b200a1afd14e85a8aaf4..7fa5c309d8d45c8492e1a39e80dd38ef4901afaa 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,3 @@
 .idea
+lang
+!lang/*_*.po
diff --git a/composer.json b/composer.json
index 88e17256195d6d4cfbef4c97ab7b84b54fb86e33..2292b8df2e9eef0d103cc25a21df3d0cd863ae35 100644
--- a/composer.json
+++ b/composer.json
@@ -15,5 +15,12 @@
       "type" : "composer",
       "url" : "https://gitlab.wpdesk.dev/Dworowy/xxx-hello-world.git"
     }
+  },
+  "extra": {
+    "text-domain": "mdworowy-hello-world",
+    "translations-folder": "lang",
+    "po-files": {
+      "pl_PL": "pl_PL.po"
+    }
   }
 }
diff --git a/src/HelloWorld.php b/src/HelloWorld.php
index 360f40bb3ce6adbabd105b3321dc5d0ea1073256..e897ed7d6d6b57f5add4274b6ec2ebce99c03107 100644
--- a/src/HelloWorld.php
+++ b/src/HelloWorld.php
@@ -4,6 +4,6 @@ namespace HelloWorld;
 
 final class HelloWorld {
 	public static function printHello(): string {
-		return "Hello World!";
+		return __("Hello World!", 'mdworowy-hello-world');
 	}
 }