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@@ -227,7 +227,20 @@ the installer. If you have a working installer image, you can update
those two files by copying new versions into place: this is much
faster than building a whole new installer image.
+## Building the installer image
+To build the installer image, run the following on a Debian system
+with the required dependencies installed and access to the Internet:
+
+~~~sh
+sudo ./build-installer.sh ~/installer.tar.gz
+~~~
+
+The file name argument, `~/installer.tar.gz`, specifies what file to
+use to cache the output of `debootstrap` between runs of the script.
+The cache is created if it doesn't exist, and is used to speed up
+repeated builds significantly. You need to use different cache if you
+change the `deboottrap` or `apt` steps in the `installer.vmdb` file.
## FAQ