diff --git a/src/device/input/button/testdata/v01.yaml b/src/device/input/button/testdata/v01.yaml
new file mode 100644
index 0000000..9da3858
--- /dev/null
+++ b/src/device/input/button/testdata/v01.yaml
@@ -0,0 +1,16 @@
+users:
+  bel:
+    player: 0
+    message: "hi"
+players:
+- buttons:
+    up: "w"
+    down: "s"
+    left: "a"
+    right: "d"
+    l: "q"
+    r: "e"
+    a: "1"
+    b: "2"
+    x: "3"
+    y: "4"
diff --git a/src/device/input/button/v01.go b/src/device/input/button/v01.go
index 1483ba6..dcd0f1e 100644
--- a/src/device/input/button/v01.go
+++ b/src/device/input/button/v01.go
@@ -25,6 +25,24 @@ type (
 		N string
 	}
 	v01Cfg struct {
+		Users map[string]struct {
+			Player  int
+			Message string
+		}
+		Players []struct {
+			Buttons struct {
+				Up    string
+				Down  string
+				Left  string
+				Right string
+				L     string
+				R     string
+				A     string
+				B     string
+				X     string
+				Y     string
+			}
+		}
 	}
 )