Add pbuilder mirror instructions.
The first time running `m` gave me a screen asking to set the mirror
site for pbuilder. This clarifies that the suggested debian.org mirror
works.
Change-Id: I09bf52f9d1a7d5d2a145c978c3a1a745cf88f164
diff --git a/GettingStarted.md b/GettingStarted.md
index da1aa66..91ee071 100644
--- a/GettingStarted.md
+++ b/GettingStarted.md
@@ -63,6 +63,8 @@
m
```
+The first time you'll be asked to set a pbuilder mirror site. Use http://deb.debian.org/debian.
+
If you have not modified any packages, and would like to speed your install:
```
FETCH_PACKAGES=true m
