Update README.md

Refine document about git submodule
2016-06-16 13:54:41 -07:00 · 2016-06-16 13:54:41 -07:00 · 9b387bfd24
commit 9b387bfd24
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@ -13,6 +13,11 @@ Build the [Azure/sonic-linux-kernel](https://github.com/Azure/sonic-linux-kernel
 Run the script to build the .deb file into ./deps directory.

    ./get_deps.sh
+    
+## 4. Fetch the git submodule
+If there is no files under ./docker-base, manually fetch them.
+
+    git submodule update --init --recursive

 # Usage
 ## Build NOS installer image