diff --git a/manifest.json b/manifest.json
index 401e5e5..1d2e696 100644
--- a/manifest.json
+++ b/manifest.json
@@ -111,7 +111,7 @@
       "icons": [
         {
           "src": "images/pdf-icon.jpg",
-          "sizes": "256x256",
+          "sizes": "256x256 512x512",
           "type": "image/png"
         }
       ],