diff --git a/.travis.yml b/.travis.yml
index 61260c2..7ab746e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -36,7 +36,7 @@ before_install:
 before_script:
   - composer dump-autoload
   - cd tests
-  - $TRAVIS_BUILD_DIR/tests/run.sh
+  - $TRAVIS_BUILD_DIR/__tests__/run.sh
   - npm install
 
 script: npm run test
diff --git a/README.md b/README.md
index 949928a..0ec22b3 100644
--- a/README.md
+++ b/README.md
@@ -100,6 +100,15 @@ connection.getQueryBuilder()
   });
 ```
 
+### REPLACE
+```javascript
+const document = {
+  id: 1,
+  content: 'this is the first post for the blog...',
+  title: 'First post'
+};
+```
+
 ### UPDATE
 ```javascript
 const document = {
@@ -143,7 +152,7 @@ const document = {
 };
 
 const insertDocumentAndCommit = async (doc) => {
-  await connection.getQueryBuilder().transaction().begin();
+  await connection.getQueryBuilder().transaction.begin();
   
   connection.getQueryBuilder()
     .insert('my_rtindex', doc)
@@ -155,7 +164,7 @@ const insertDocumentAndCommit = async (doc) => {
       console.log(err);
     });
 
-    await connection.getQueryBuilder().transaction().commit();
+    await connection.getQueryBuilder().transaction.commit();
 
     return true;
 }
diff --git a/src/QueryBuilder.ts b/src/QueryBuilder.ts
index e2af0f4..fb78c02 100644
--- a/src/QueryBuilder.ts
+++ b/src/QueryBuilder.ts
@@ -46,6 +46,10 @@ export default class QueryBuilder {
     return new DeleteStatement(this.connection, index);
   }
 
+  public optimizeIndex(index: string): Promise<any> {
+    return this.connection.query(`OPTIMIZE INDEX ${index}`);
+  }
+
   get transaction(): TransactionStatement {
     return new TransactionStatement(this.connection);
   }