diff --git a/README.md b/README.md
index d90284f..9efc0b7 100644
--- a/README.md
+++ b/README.md
@@ -77,10 +77,11 @@ ipIndex.add([1, 0]);
 // Serialize an index
 const index_buf = newIndex.toBuffer();
 const deserializedIndex = Index.fromBuffer(index_buf);
+console.log(deserializedIndex.ntotal()); // 3
 
 // Factory index
 const hnswIndex = Index.fromFactory(2, 'HNSW,Flat', MetricType.METRIC_INNER_PRODUCT);
-const x = [1,0,0,1];
+const x = [1, 0, 0, 1];
 hnswIndex.train(x);
 hnswIndex.add(x);
 ```
diff --git a/examples/index.js b/examples/index.js
index 0c2dac6..dfafc4f 100644
--- a/examples/index.js
+++ b/examples/index.js
@@ -1,38 +1,60 @@
-const { IndexFlatL2 } = require('../');
+const { IndexFlatL2, Index, IndexFlatIP, MetricType } = require('../');
 
 const dimension = 2;
 const index = new IndexFlatL2(dimension);
 
-console.log(index.getDimension());
-console.log(index.isTrained());
-console.log(index.ntotal());
+console.log(index.getDimension()); // 2
+console.log(index.isTrained()); // true
+console.log(index.ntotal()); // 0
+
+// inserting data into index.
 index.add([1, 0]);
 index.add([1, 2]);
 index.add([1, 3]);
 index.add([1, 1]);
-console.log(index.ntotal());
+
+console.log(index.ntotal()); // 4
 
 const k = 4;
 const results = index.search([1, 0], k);
-console.log(results.labels);
-console.log(results.distances);
+console.log(results.labels); // [ 0, 3, 1, 2 ]
+console.log(results.distances); // [ 0, 1, 4, 9 ]
 
+// Save index
 const fname = 'faiss.index';
 index.write(fname);
 
+// Load saved index
 const index_loaded = IndexFlatL2.read(fname);
-console.log(index_loaded.getDimension());
-console.log(index_loaded.ntotal());
+console.log(index_loaded.getDimension()); //2
+console.log(index_loaded.ntotal()); //4
 const results1 = index_loaded.search([1, 1], 4);
-console.log(results1.labels);
-console.log(results1.distances);
+console.log(results1.labels); // [ 3, 0, 1, 2 ]
+console.log(results1.distances); // [ 0, 1, 1, 4 ]
 
+// Merge index
 const newIndex = new IndexFlatL2(dimension);
 newIndex.mergeFrom(index);
-console.log(newIndex.ntotal());
+console.log(newIndex.ntotal()); // 4
 
-console.log(newIndex.search([1, 2], 1));
+// Remove items
+console.log(newIndex.search([1, 2], 1)); // { distances: [ 0 ], labels: [ 1 ] }
 const removedCount = newIndex.removeIds([0]);
-console.log(removedCount);
-console.log(newIndex.ntotal());
-console.log(newIndex.search([1, 2], 1));
\ No newline at end of file
+console.log(removedCount); // 1
+console.log(newIndex.ntotal()); // 3
+console.log(newIndex.search([1, 2], 1)); // { distances: [ 0 ], labels: [ 0 ] }
+
+// IndexFlatIP
+const ipIndex = new IndexFlatIP(2);
+ipIndex.add([1, 0]);
+
+// Serialize an index
+const index_buf = newIndex.toBuffer();
+const deserializedIndex = Index.fromBuffer(index_buf);
+console.log(deserializedIndex.ntotal()); // 3
+
+// Factory index
+const hnswIndex = Index.fromFactory(2, 'HNSW,Flat', MetricType.METRIC_INNER_PRODUCT);
+const x = [1, 0, 0, 1];
+hnswIndex.train(x);
+hnswIndex.add(x);
\ No newline at end of file