diff --git a/README.md b/README.md
index c56bcea..5d14407 100644
--- a/README.md
+++ b/README.md
@@ -3,6 +3,9 @@ gStore
 
 ## gStore2.0
 
+### Overview
+gStore is a graph-based RDF data management system (or what is commonly called a “triple store”) that maintains the graph structure of the original RDF data. Its data model is a labeled, directed multiedge graph, where each vertex corresponds to a subject or an object. We also represent a given SPARQL query by a query graph Q. Query processing involves finding subgraph matches of Q over the RDF graph G. gStore incorporates an index over the RDF graph (called VS-tree) to speed up query processing. VS-tree is a heightbalanced tree with a number of associated pruning techniques to speed up subgraph matching.
+
 ### Install Steps
 System Requirement: 64bit linux with g++, gcc, make installed.