Document installation from source release (#57)
diff --git a/README.md b/README.md
index 8fa12c8..ff5030a 100644
--- a/README.md
+++ b/README.md
@@ -207,3 +207,13 @@
This explicit SSL configuration is currently only necessary when using parallel
combinators or the `async` combinator.
+
+# Installation from Source
+
+To install composer from a source release, download the composer source code
+from the [Apache OpenWhisk
+Downloads](https://openwhisk.apache.org/downloads.html) page, rename the release
+tarball to `openwhisk-composer.tgz` and install it with command:
+```shell
+npm install -g openwhisk-composer.tgz
+```
