Update instructions for new behavior of fx set
Change-Id: Ib4c0095c433911971b1d3bce03dd490d107656ac
diff --git a/README.md b/README.md
index 081f019..ec135ca 100644
--- a/README.md
+++ b/README.md
@@ -46,23 +46,24 @@
## Getting started
-Since at the moment fargo requires the FUCHSIA\_ROOT environmental variable be
-set to the path to a Fuchsia **release** build, the first step is to build
-Fuchsia.
+Since at the moment fargo requires the FUCHSIA\_DIR environmental variable be
+set to the path to a Fuchsia source tree containing a **release** build,
+the first step is to build Fuchsia.
The [Fuchsia Getting
Started](https://fuchsia.googlesource.com/docs/+/HEAD/getting_started.md)
instruction are what you need. Since a release build is what fargo expects to
-find you'll want to pass --release to fx/set. The Rust components that fargo
-needs to cross compile are part of garnet, so you must be using the
-garnet layer or higher.
+find you'll want to pass --args "is_debug=false" to fx/set. You'll also need to
+specify `out/release-x64` or `out/debug-x64` as the out directory when using
+`fx set`. The Rust components that fargo needs to cross compile are part of garnet,
+so you must be using the garnet layer or higher.
The author most often uses the following steps to update and build Fuchsia in
preparation for using fargo
./scripts/fx set-layer garnet
.jiri_root/bin/jiri update
- ./scripts/fx set x64 --release
+ ./scripts/fx set x64 out/release-x64 --args "is_debug=false"
./scripts/fx build-zircon
./scripts/fx build
@@ -122,7 +123,7 @@
## Using different versions of cargo and rustc
-By default fargo will use the copies of cargo and rustc provided in `$FUCHSIA_ROOT/buildtools`.
+By default fargo will use the copies of cargo and rustc provided in `$FUCHSIA_DIR/buildtools`.
To change this behavior, set the environmental variables `FARGO_CARGO` and `FARGO_RUSTC` before
running fargo.
