diff --git a/create-replica b/create-replica
new file mode 100644
index 0000000..daea878
--- /dev/null
+++ b/create-replica
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+# connect to PRIMARY
+mongo
+> rs.initiate()
+> rs.status()
+> rs.add("mongo_node2")
+> rs.add("mongo_node3")
+> rs.status()
+> rs.isMaster()
+
+#You now have a working MongoDB replication. 
+#You can increase the cluster size from *three* nodes to *five* nodes, *seven* nodes or more. 
+#This number is calculated from: [Master Eligible Nodes) / 2 + 1], which means an odd number of nodes is required for high availability, the minimum number is *three*.