diff --git a/.gitmodules b/.gitmodules
index b130482..e2e3f4c 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -7,3 +7,7 @@
 #
 # Copyright 2021 林博仁(Buo-ren, Lin) <Buo.Ren.Lin@gmail.com>
 # SPDX-License-Identifier: CC-BY-SA-4.0
+[submodule "Docker"]
+	path = Docker
+	url = https://gitlab.com/libre-knowledge/docker.git
+	ignore = dirty
diff --git a/Docker b/Docker
new file mode 160000
index 0000000..d669dd4
--- /dev/null
+++ b/Docker
@@ -0,0 +1 @@
+Subproject commit d669dd4b7959e679707b57110467a71596f97430
diff --git a/README.md b/README.md
index 6d9cfab..3840aa7 100644
--- a/README.md
+++ b/README.md
@@ -90,7 +90,8 @@
 
 ## 解決方案
 
-* Docker
+* [Docker](https://gitlab.com/libre-knowledge/docker)  
+  主流的容器實現之一
 * LXC
 * LXD
 * Oracle VirtualBox