diff --git a/calculator.html b/calculator.html
index 521c66b..a155980 100644
--- a/calculator.html
+++ b/calculator.html
@@ -58,7 +58,8 @@
     <div id="controls">
       <h1>Compilers 101 Toy Calculator</h1>
       <p class="srclink"><a href="docs/calculator-parser.html">parser source</a>
-        | <a href="docs/calculator-backends.html">back-end source</a></p>
+        | <a href="docs/calculator-backends.html">back-end source</a>
+        | <a href="https://github.com/jorendorff/toy-calculator">on github</a></p>
       <ul id="options">
         <li><label><input type="radio" name="mode" value="json" checked>JSON mode</label>
         <li><label><input type="radio" name="mode" value="blocks">Scratch mode</label>