diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..a06ab3d
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,6 @@
+[submodule "references/noc"]
+	path = references/noc
+	url = https://github.com/takassh/notion-client.git
+[submodule "references/hype"]
+	path = references/hype
+	url = https://github.com/hyperliquid-dex/hyperliquid-rust-sdk.git
diff --git a/CHANGELOG.md b/CHANGELOG.md
index d4362f2..41b20a5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,8 @@
 格式遵循 Keep a Changelog，版本号遵循 SemVer。
 
 ## [Unreleased]
+### Added
+- 添加外部参考库作为 Git 子模块：`noc` (notion-client) 与 `hype` (hyperliquid-rust-sdk)
 
 ## [0.1.0] - 2026-05-30
 ### Added
diff --git a/references/hype b/references/hype
new file mode 160000
index 0000000..aac7558
--- /dev/null
+++ b/references/hype
@@ -0,0 +1 @@
+Subproject commit aac75585daf12d0a3761126cc7da7a5e035b5853
diff --git a/references/noc b/references/noc
new file mode 160000
index 0000000..6d5c7b9
--- /dev/null
+++ b/references/noc
@@ -0,0 +1 @@
+Subproject commit 6d5c7b94e372e52416a22117afdea1871c98bd3b