diff --git a/history/002_first_eye/src/main/java/com/github/drinkjava2/frog/brain/Output.java b/history/002_first_eye/src/main/java/com/github/drinkjava2/frog/brain/Output.java
new file mode 100644
index 0000000..18cf083
--- /dev/null
+++ b/history/002_first_eye/src/main/java/com/github/drinkjava2/frog/brain/Output.java
@@ -0,0 +1,24 @@
+/*
+ * Copyright 2018 the original author or authors. 
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by
+ * applicable law or agreed to in writing, software distributed under the
+ * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
+ * OF ANY KIND, either express or implied. See the License for the specific
+ * language governing permissions and limitations under the License.
+ */
+package com.github.drinkjava2.frog.brain;
+
+import com.github.drinkjava2.frog.egg.Zone;
+
+/**
+ * Output can active other nerve cell's input
+ * 
+ * @author Yong Zhu
+ * @since 1.0
+ */
+@SuppressWarnings("serial")
+public class Output extends Zone {
+	public Cell cell;
+}