diff --git a/goroutine/README.md b/goroutine/README.md
new file mode 100644
index 0000000..c0eafde
--- /dev/null
+++ b/goroutine/README.md
@@ -0,0 +1,3 @@
+## MEMO
+
+- 最初に呼び出されるgoroutineはmain goroutine