diff --git a/composer.json b/composer.json
index 1d2a1e71..3c89bca6 100644
--- a/composer.json
+++ b/composer.json
@@ -36,6 +36,10 @@
         "lib-libxml" : "*",
         "sweetrdf/rdf-helpers": "^2.0"
     },
+    "suggest": {
+        "ml/json-ld": "^1.0",
+        "semsol/arc2": "^3"
+    },
     "require-dev": {
         "friendsofphp/php-cs-fixer": "^3.0",
         "ml/json-ld": "^1.0",