diff --git a/README.md b/README.md
index cc9201e..c654e75 100644
--- a/README.md
+++ b/README.md
@@ -76,7 +76,7 @@ development. It also has excellent Javascript debugging tools.
 
 
 Reference documentation, including full API details, is at
-[http://undum.com/doc/](http://undum.com/doc/),
+[http://idmillington.github.io/undum/](http://idmillington.github.io/undum/),
 and is also included in the repository.
 
 The source code for all the files is also heavily commented, so if you
diff --git a/games/tutorial.en.html b/games/tutorial.en.html
index ed6a3d4..79919ae 100644
--- a/games/tutorial.en.html
+++ b/games/tutorial.en.html
@@ -104,7 +104,7 @@ <h2>by I D Millington</h2>
           <!-- End of Your Copyright -->
 
           <!-- This line is totally optional. -->
-          <p>Created with <a href="http://undum.com">Undum</a>.</p>
+          <p>Created with <a href="http://idmillington.github.io/undum/">Undum</a>.</p>
         </div>
       </div>
     </div> <!-- End of div.page -->
diff --git a/games/tutorial.ru.html b/games/tutorial.ru.html
index 21d6a1e..523370d 100644
--- a/games/tutorial.ru.html
+++ b/games/tutorial.ru.html
@@ -93,7 +93,7 @@ <h2>Движок гипертекстовых игр</h2>
 
           <!-- Нам будет приятно, если вы оставите эту ссылку в своей игре. -->
           <p>
-            Создано с использованием <a href="http://undum.com">Undum.</a>
+            Создано с использованием <a href="http://idmillington.github.io/undum/">Undum.</a>
           </p>
         </div>
       </div>