diff --git a/README.md b/README.md
index 3d86093..798e78f 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 ## Go by Example
 
-Source for the [Go by Example](https://gobyexample.com)
-site.
+Content and toolchain source for the
+[Go by Example](https://gobyexample.com) site.
 
 
 ### Overview
@@ -39,6 +39,16 @@ Generation requires the [`pygmentize`](http://pygments.org/)
 binary for syntax highlighting.
 
 
+### Serving
+
+The site is served by the [gobyexample-server](https://github.com/mmcgrana/gobyexample-server)
+tool. To export to this tool:
+
+```console
+$ SITEDIR = ../gobyexample-server/public tool/build
+```
+
+
 ### License
 
 This work is licensed under a [Creative Commons Attribution 3.0 Unported License](http://creativecommons.org/licenses/by/3.0/).
diff --git a/tool/generate.go b/tool/generate.go
index babf717..3a6405b 100644
--- a/tool/generate.go
+++ b/tool/generate.go
@@ -101,6 +101,13 @@ func whichLexer(path string) string {
     return ""
 }
 
+func whichSiteDir() {
+    dir := os.Getenv("SITEDIR")
+    if dir != "" {
+        siteDir = dir
+    }
+}
+
 func debug(msg string) {
     if os.Getenv("DEBUG") == "1" {
         fmt.Fprintln(os.Stderr, msg)
@@ -228,6 +235,7 @@ func renderChapters(chapters []*Chapter) {
 }
 
 func main() {
+    whichSiteDir()
     ensureDir(siteDir)
     copyFile("template/site.css", siteDir+"/site.css")
     chapters := parseChapters()