diff --git a/schema.json b/schema.json
index c79c1c6..ec89b65 100644
--- a/schema.json
+++ b/schema.json
@@ -47,6 +47,12 @@
                 "git-tree-sha256": {
                     "type": "string"
                 },
+                "etag": {
+                    "type": "string"
+                },
+                "last-modified": {
+                    "type": "string"
+                },
                 "size": {
                     "type": "integer"
                 },
diff --git a/test/more_tests.jl b/test/more_tests.jl
index 82d4ff4..93fe51c 100644
--- a/test/more_tests.jl
+++ b/test/more_tests.jl
@@ -67,8 +67,10 @@ end
                     ]
                     optional_keys = [
                         "asc",
+                        "etag",
                         "git-tree-sha1",
                         "git-tree-sha256",
+                        "last-modified",
                     ]
                     allowed_keys = union(required_keys, optional_keys)
                     @test required_keys ⊆ collect(keys(filedict))