Add Master-master replication link

43cd75f7 · Donne Martin · dd618e26 · 43cd75f7
Commit 43cd75f7 authored Mar 07, 2017 by Donne Martin
--- a/README.md
+++ b/README.md
@@ -122,6 +122,7 @@ Review the [Contributing Guidelines](https://github.com/donnemartin/system-desig
 * [Database](#database)
    * [Relational database management system (RDBMS)](#relational-database-management-system-rdbms)
        * [Master-slave replication](#master-slave-replication)
+        * [Master-master replication](#master-master-replication)
        * [Federation](#federation)
        * [Sharding](#sharding)
        * [Denormalization](#denormalization)