diff --git a/README.md b/README.md
index 04f9407..966853d 100644
--- a/README.md
+++ b/README.md
@@ -431,6 +431,7 @@ search configuration options:
 | `customEvents` | `Object` | To set the custom events, for e.g `{ "platform": mac }`                                |
 | `filters`      | `Object` | It allows to record the applied facets on the search query, for e.g `{ "year": 2018 }` |
 | `hits`         | `Array`  | To set the search hits, a hit object can have the `id`, `type` & `source` properties . |
+| `impressions`  | `Array`  | To set the impressions, a hit object can have the `id` & `index` properties.           |
 
 <b>Note: </b>
 
@@ -627,16 +628,13 @@ deleteSavedSearch(savedSearchId: string, callback: Function)
 An example with all possible options:
 
 ```ts
-deleteSavedSearch(
-  'analytics-js-test',
-  (err, res) => {
-    if (err) {
-      // handle error
-    } else if (res) {
-      // handle response
-    }
+deleteSavedSearch('analytics-js-test', (err, res) => {
+  if (err) {
+    // handle error
+  } else if (res) {
+    // handle response
   }
-);
+});
 ```
 
 #### Get saved searches
diff --git a/src/index.js b/src/index.js
index 7ce9549..77ab1fd 100644
--- a/src/index.js
+++ b/src/index.js
@@ -17,6 +17,11 @@ type Hit = {
   source?: Object
 };
 
+type Impression = {
+  id: string,
+  index: 'good-books-ds'
+};
+
 type AnalyticsConfig = {
   index: string,
   url: string,
@@ -31,7 +36,8 @@ type SearchConfig = {
   queryID?: string,
   customEvents?: { [key: string]: string },
   filters?: { [key: string]: string },
-  hits?: Array<Hit>
+  hits?: Array<Hit>,
+  impressions?: Array<Impression>
 };
 
 type SearchRequestBody = {
@@ -233,7 +239,8 @@ function initClient(config: AnalyticsConfig = {}) {
         query_id: searchConfig.queryID,
         custom_events: searchConfig.customEvents,
         filters: searchConfig.filters,
-        hits: searchConfig.hits
+        hits: searchConfig.hits,
+        impressions: searchConfig.impressions
       };
       metrics._request(
         'PUT',
diff --git a/src/index.test.js b/src/index.test.js
index 4c67f83..01d5893 100644
--- a/src/index.test.js
+++ b/src/index.test.js
@@ -28,6 +28,24 @@ test('registerSearch', done => {
           },
           type: '_doc'
         }
+      ],
+      impressions: [
+        {
+          id: '3DftXXEBdEU4aeo6Gdqs',
+          index: 'good-books-ds'
+        },
+        {
+          id: '3TftXXEBdEU4aeo6Gdqs',
+          index: 'good-books-ds'
+        },
+        {
+          id: '3jftXXEBdEU4aeo6Gdqs',
+          index: 'good-books-ds'
+        },
+        {
+          id: '3zftXXEBdEU4aeo6Gdqs',
+          index: 'good-books-ds'
+        }
       ]
     },
     (err, res) => {