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
parent 85f354b77b
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--- a/README.md
+++ b/README.md
@ -14,6 +14,11 @@ 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