diff --git a/composer.json b/composer.json
index c9cd37c..44da3c3 100644
--- a/composer.json
+++ b/composer.json
@@ -43,5 +43,8 @@
         "branch-alias": {
             "dev-master": "2.0.x-dev"
         }
+    },
+    "suggest": {
+        "ext-zip": "To support writing of Excel files"
     }
 }