[meta] Update README to include how to update submodules
change
commit 615fafb54e8fea0b6b8adb93ddadb3c40f1b3e5e
author Alpha Chen <alpha.chen@gmail.com>
date
parent 87b37a20 
diff --git a/README.md b/README.md
index 21afd735..d39d5e90 100644
--- a/README.md
+++ b/README.md
@@ -32,6 +32,12 @@ rm -rf ~/.dotfiles
 ln -s ~/Dropbox/dotfiles ~/.dotfiles
 ```
 
+To update submodules:
+
+``` shell
+git submodule foreach git pull
+```
+
 # Development
 
 Ansible tags are indispensible when tweaking the config.