diff --git a/samples/verg.yml b/samples/verg.yml
index 7cbffe7..ddb91b0 100644
--- a/samples/verg.yml
+++ b/samples/verg.yml
@@ -1 +1,2 @@
 name: Verg-La
+player: Yanick
diff --git a/schemas-yaml/character.yml b/schemas-yaml/character.yml
index f66585a..7fb1b98 100644
--- a/schemas-yaml/character.yml
+++ b/schemas-yaml/character.yml
@@ -1,3 +1,11 @@
 $id: https://hyperboria.babyl.ca/character.json
 title: Hyperboria character sheet
 type: object
+additionalProperties: false
+required:
+    - name
+    - player
+properties:
+    name: &string
+        type: string
+    player: *string