Update README.md.

1 files changed, 11 insertions, 5 deletions

diff --git a/README.md b/README.md
index 242e1ca1..34cbb0b8 100644
--- a/README.md
+++ b/README.md
@@ -36,7 +36,7 @@ Please note that as of this writing the high-level API is very
 incomplete.
 
 Command line interface
---------------
+----------------------
 
 Sequoia includes a simple frontend `sq` (crate [tool](./tool)) that
 can be used to experiment with Sequoia and OpenPGP. It is also an
@@ -75,7 +75,7 @@ any later version.  See the file [LICENSE.txt](LICENSE.txt) or visit
 https://www.gnu.org/licenses/gpl-2.0.html for details.
 
 Using Sequoia
-================
+=============
 
 If you want to use Sequoia from Rust, you can simply register the
 dependency in your `Cargo.toml` file as with any other project.  Note
@@ -91,11 +91,13 @@ Building Sequoia
 Using cargo
 -----------
 
-To build Sequoia, simply execute `cargo build [--release]`.
-To build `sq`, run `cargo build [--release] -p sequoia-tool`.
+To build all Sequoia components, simply execute `cargo build
+[--release] --all`.  Individual components may be built independently,
+e.g. to build `sq`, run `cargo build [--release] -p sequoia-tool`, or
+build `sequoia-openpgp-ffi` to build a shared object with the C API.
 
 Using the Makefile
------------
+------------------
 
 We also consider the needs of packagers in times
 where distribution support for packaging Rust projects is not yet
@@ -108,6 +110,10 @@ use `make install`.  The latter target honors `PREFIX` and `DESTDIR`.
 Finally, to return your source tree to its pristine state, run `make
 clean`.
 
+You can specify subdirectories to build individual modules, e.g. use
+`make -Copenpgp-ffi install` to only install the shared object with
+the C API.
+
 **Note:** By default the Python FFI bindings are also built. To skip
 these add `PYTHON=disable` to all `make` invocations. E.g. `make
 PYTHON=disable`.