diff --git a/schema/project.json b/schema/project.json
index ded7706e2..cce438bd5 100644
--- a/schema/project.json
+++ b/schema/project.json
@@ -79,6 +79,17 @@
         "Tools"
       ],
       "type": "string"
+    },
+    "downloads": {
+      "description": "Optional list of download URLs.",
+      "type": "array",
+      "items": {
+        "type": "string",
+        "format": "uri"
+      },
+      "minItems": 1,
+      "uniqueItems": true,
+      "optional": true
     }
   },
   "required": [
diff --git a/schema/tests/project_test.py b/schema/tests/project_test.py
index 6ca707cf5..6a090a04c 100644
--- a/schema/tests/project_test.py
+++ b/schema/tests/project_test.py
@@ -26,6 +26,8 @@ def test_positive(project_schema):
         ("level-invalid.yaml", "2.5 is not one of [2, 3, 3.5, 4]"),
         ("name-empty.yaml", "'' is too short"),
         ("name-none.yaml", "None is not of type 'string'"),
+        ("downloads-empty.yaml", "[] is too short"),
+        ("downloads-invalid.yaml", "'not-a-url' is not a valid URL"),
     ],
 )
 def test_negative(project_schema, file_path, error_message):