diff --git a/README.md b/README.md
index 3401792..329f8d0 100644
--- a/README.md
+++ b/README.md
@@ -64,12 +64,6 @@ The code the master process runs will expose an API with a single endpoint `/clu
 
 ## Options
 
-Metrics type:
-
-* **metricsType**: two metrics type are supported for `http_request_duration_seconds` metric: [histogram](https://prometheus.io/docs/concepts/metric_types/#histogram) and [summary](https://prometheus.io/docs/concepts/metric_types/#summary),  default: **histogram**
-
-
-
 Which labels to include in `http_request_duration_seconds` metric:
 
 * **includeStatusCode**: HTTP status code (200, 400, 404 etc.), default: **true**
@@ -90,6 +84,10 @@ Extra transformation callbacks:
 * **formatStatusCode**: `function(res)` producing final status code from express `res` object, e.g. you can combine `200`, `201` and `204` to just `2xx`.
 * **transformLabels**: `function(labels, req, res)` transforms the **labels** object, e.g. setting dynamic values to **customLabels**
 
+Metric type:
+
+* **metricType**: two metric types are supported for `http_request_duration_seconds` metric: [histogram](https://prometheus.io/docs/concepts/metric_types/#histogram) and [summary](https://prometheus.io/docs/concepts/metric_types/#summary),  default: **histogram**
+
 Other options:
 
 * **buckets**: buckets used for `http_request_duration_seconds` histogram
diff --git a/spec/index.spec.js b/spec/index.spec.js
index 45cba11..7feda7b 100644
--- a/spec/index.spec.js
+++ b/spec/index.spec.js
@@ -186,10 +186,10 @@ describe('index', () => {
       });
   });
 
-  it('metrics type summary works', done => {
+  it('metric type summary works', done => {
     const app = express();
     const bundled = bundle({
-      metricsType: 'summary',
+      metricType: 'summary',
       percentiles: [0.5, 0.85, 0.99],
     });
     app.use(bundled);
@@ -207,10 +207,10 @@ describe('index', () => {
     });
   });
 
-  it('metrics type histogram works', done => {
+  it('metric type histogram works', done => {
     const app = express();
     const bundled = bundle({
-      metricsType: 'histogram',
+      metricType: 'histogram',
       buckets: [10, 100],
     });
     app.use(bundled);
@@ -230,7 +230,7 @@ describe('index', () => {
 
   it('throws on unknown metricType ', () => {
     expect(() => {
-      bundle({metricsType: 'hello',});
+      bundle({metricType: 'hello'});
     }).toThrow();
   });
 
diff --git a/src/index.js b/src/index.js
index 2dec3e6..eac05cf 100644
--- a/src/index.js
+++ b/src/index.js
@@ -62,7 +62,7 @@ function main(opts) {
       includeStatusCode: true,
       normalizePath: main.normalizePath,
       formatStatusCode: main.normalizeStatusCode,
-      metricsType: 'histogram',
+      metricType: 'histogram',
       promClient: {}
     },
     opts
@@ -108,14 +108,14 @@ function main(opts) {
         labels.push.apply(labels, Object.keys(opts.customLabels));
       }
 
-      if (opts.metricsType === 'summary') {
+      if (opts.metricType === 'summary') {
         return new promClient.Summary({
           name: httpMetricName,
           help: 'duration summary of http responses labeled with: ' + labels.join(', '),
           labelNames: labels,
           percentiles: opts.percentiles || [0.5, 0.75, 0.95, 0.98, 0.99, 0.999]
         });
-       } else if (opts.metricsType === 'histogram' || !opts.metricsType) {
+       } else if (opts.metricType === 'histogram' || !opts.metricType) {
         return new promClient.Histogram({
           name: httpMetricName,
           help: 'duration histogram of http responses labeled with: ' + labels.join(', '),
@@ -123,7 +123,7 @@ function main(opts) {
           buckets: opts.buckets || [0.003, 0.03, 0.1, 0.3, 1.5, 10]
         });
       } else {
-        throw new Error('metricsType option must be histogram or summary');
+        throw new Error('metricType option must be histogram or summary');
       }
     }
   };