diff --git a/src/main/java/com/example/cosmos_serversb/entities/package-info.java b/src/main/java/com/example/cosmos_serversb/entities/package-info.java
new file mode 100644
index 0000000..9a8250e
--- /dev/null
+++ b/src/main/java/com/example/cosmos_serversb/entities/package-info.java
@@ -0,0 +1,9 @@
+/**
+ * com.example.cosmos_serversb.entities
+ *
+ * <pre>
+ * // TODO 最小単位の情報を管理
+ * </pre>
+ *
+ */
+package com.example.cosmos_serversb.entities;
\ No newline at end of file