diff --git a/contents.md b/contents.md
index 8ae853812..2ec4b0018 100644
--- a/contents.md
+++ b/contents.md
@@ -12,7 +12,9 @@ for updates and to help us make them better.
 *   [Introduction](intro.html)
 *   [The Unix Shell](novice/shell/index.html)
 *   [Version Control with Git](novice/git/index.html)
+*   [Version Control with Mercurial](novice/hg/index.html)
 *   [Programming with Python](novice/python/index.html)
+*   [Programming with R](novice/r/index.html)
 *   [Using Databases and SQL](novice/sql/index.html)
 *   [A Few Extras](novice/extras/index.html)
 *   [Reference](novice/ref/index.html)