diff --git a/README.md b/README.md
index 7f41e7b..14954fd 100644
--- a/README.md
+++ b/README.md
@@ -386,6 +386,7 @@ First, you'll need a basic understanding of common principles, learning about wh
     * Load balancing
     * Database replication
     * Database partitioning
+    * High availability 
 
 ### Step 2: Review the scalability article