diff --git a/infra/README.md b/device/README.md
similarity index 89%
rename from infra/README.md
rename to device/README.md
index fe7a1ad..7f0baef 100644
--- a/infra/README.md
+++ b/device/README.md
@@ -1,3 +1,3 @@
-# infra
+# device
 
 実際のセンサー・アクチュエーターとやり取りする部分
diff --git a/packet/README.md b/packet/README.md
new file mode 100644
index 0000000..8735d26
--- /dev/null
+++ b/packet/README.md
@@ -0,0 +1,3 @@
+# packet
+
+app, device間でやり取りするデータ構造
diff --git a/payloads/README.md b/payloads/README.md
deleted file mode 100644
index 7a8856c..0000000
--- a/payloads/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# payloads
-
-app, infra間でやり取りするデータ構造