diff --git a/README.md b/README.md
index b7321c2..bdb65d0 100644
--- a/README.md
+++ b/README.md
@@ -60,6 +60,21 @@ Becomes this:
 
 Note the `Hi Bobs!`
 
+## Available Lexers
+
+This is currently only a demo, so we've hardcoded a small number of lexers:
+
+* ruby
+* js
+* python
+* scheme
+
+Use `{{# highlight_scheme}} code {{/ highlight_scheme}}`, for example,
+to activate one of the lexers.
+
+To get a complete list run `rake lexers` in the root of this project.
+
+
 ## Dependencies
 
 * Pygments
diff --git a/Rakefile b/Rakefile
new file mode 100644
index 0000000..aaf3ab7
--- /dev/null
+++ b/Rakefile
@@ -0,0 +1,11 @@
+
+desc "List the available lexers"
+task :lexers do
+  $LOAD_PATH.unshift 'lib'
+  require 'mustache/plugins/syntax_highlighter'
+
+  lexers =
+    Mustache::Plugins::SyntaxHighlighter.instance_methods.grep(/highlight/)
+  puts 'Lexers:'
+  puts lexers.map { |lexer| '  ' + lexer.sub('highlight_', '') }
+end