diff --git a/modules/mediakeysBidAdapter.js b/modules/mediakeysBidAdapter.js
index 8c2b2c32e1c..60ced650329 100644
--- a/modules/mediakeysBidAdapter.js
+++ b/modules/mediakeysBidAdapter.js
@@ -572,7 +572,12 @@ function nativeBidResponseHandler(bid) {
           native.impressionTrackers.push(tracker.url);
           break;
         case 2:
-          native.javascriptTrackers = `<script src=\"${tracker.url}\"></script>`;
+          const script = `<script async src=\"${tracker.url}\"></script>`;
+          if (!native.javascriptTrackers) {
+            native.javascriptTrackers = script;
+          } else {
+            native.javascriptTrackers += `\n${script}`;
+          }
           break;
       }
     });
diff --git a/modules/mediakeysBidAdapter.md b/modules/mediakeysBidAdapter.md
index ec313c2fe3a..b0654771d19 100644
--- a/modules/mediakeysBidAdapter.md
+++ b/modules/mediakeysBidAdapter.md
@@ -14,9 +14,10 @@ Connects to Mediakeys demand source to fetch bids.
 
 ## Banner only Ad Unit
 
-```
-var adUnits = [
-{
+The Mediakeys adapter accepts any valid OpenRTB Spec 2.5 property.
+
+```javascript
+var adUnits = [{
     code: 'test',
     mediaTypes: {
         banner: {
@@ -27,20 +28,26 @@ var adUnits = [
         bidder: 'mediakeys',
         params: {} // no params required.
     }]
-},
+}]
 ```
 
 ## Native only Ad Unit
 
 The Mediakeys adapter accepts two optional params for native requests. Please see the [OpenRTB Native Ads Specification](https://www.iab.com/wp-content/uploads/2018/03/OpenRTB-Native-Ads-Specification-Final-1.2.pdf) for valid values.
 
-```
-var adUnits = [
-{
+```javascript
+var adUnits = [{
     code: 'test',
     mediaTypes: {
         native: {
-            type: 'image',
+            title: {
+                required: true,
+                len: 120
+            },
+            image: {
+                required: true,
+                sizes: [300, 250]
+            }
         }
     },
     bids: [{
@@ -52,7 +59,7 @@ var adUnits = [
             }
         }
     }]
-},
+}]
 ```
 
 ## Video only Ad Unit
@@ -61,63 +68,65 @@ The Mediakeys adapter accepts any valid openRTB 2.5 video property. Properties c
 
 ### Outstream context
 
-```
-var adUnits = [
-{
+```javascript
+var adUnits = [{
     code: 'test',
     mediaTypes: {
         video: {
             context: 'outstream',
-            playerSize: [300, 250],
+            playerSize: [1280, 720],
             // additional OpenRTB video params
             // placement: 2,
             // api: [1],
             // …
+            mimes: ['video/mp4'],
+            protocols: [2, 3],
+            skip: 0
         }
     },
     renderer: {
         url: 'https://acdn.adnxs.com/video/outstream/ANOutstreamVideo.js',
+        // the render method must fetch the vast xml document before displaying video
         render: function (bid) {
-            var bidReqConfig = pbjs.adUnits.find(bidReq => bidReq.bidId === bid.impid);
-
-            if (bidReqConfig && bidReqConfig.mediaTypes && bidReqConfig.mediaTypes.video && bidReqConfig.mediaTypes.video.context === 'outstream') {
-                var adResponse = fetch(bid.vastUrl).then(resp => resp.text()).then(text => ({
-                    ad: {
-                        video: {
-                            content: text,
-                            player_width: bid.width || bidReqConfig.mediaTypes.video.playerSize[0],
-                            player_height: bid.height || bidReqConfig.mediaTypes.video.playerSize[1],
-                        }
+            var adResponse = fetch(bid.vastUrl).then(resp => resp.text()).then(text => ({
+                ad: {
+                    video: {
+                        content: text,
+                        player_height: bid.playerHeight,
+                        player_width: bid.playerWidth
                     }
-                }))
-
-                adResponse.then((ad) => {
-                    bid.renderer.push(() => {
-                        ANOutstreamVideo.renderAd({
-                            targetId: bid.adUnitCode,
-                            adResponse: ad
-                        });
+                }
+            }))
+
+            adResponse.then((content) => {
+                bid.renderer.push(() => {
+                    ANOutstreamVideo.renderAd({
+                        targetId: bid.adUnitCode,
+                        adResponse: content
                     });
-                })
-            }
+                });
+            })
         }
     },
     bids: [{
         bidder: 'mediakeys',
         params: {
             video: {
-                // additional OpenRTB video params. Will be merged with params defined at mediaTypes level
+                // additional OpenRTB video params.
+                // will be merged with params defined at mediaTypes level
+                api: [1]
             }
         }
     }]
-},
+}]
 ```
 
 ### Instream context
 
-```
-var adUnits = [
-{
+For Instream Video, you have to enable the Instream Tracking Module to have Prebid emit the onBidWon required event.
+
+```javascript
+var adUnits = [{
     code: 'test',
     mediaTypes: {
         video: {
@@ -132,8 +141,9 @@ var adUnits = [
     bids: [{
         bidder: 'mediakeys',
         params: {
-            // additional OpenRTB video params. Will be merged with params defined at mediaTypes level
+            // additional OpenRTB video params.
+            // will be merged with params defined at mediaTypes level
         }
     }]
-},
+}]
 ```
diff --git a/test/spec/modules/mediakeysBidAdapter_spec.js b/test/spec/modules/mediakeysBidAdapter_spec.js
index 47ac54d49df..393b6ac6764 100644
--- a/test/spec/modules/mediakeysBidAdapter_spec.js
+++ b/test/spec/modules/mediakeysBidAdapter_spec.js
@@ -808,8 +808,8 @@ describe('mediakeysBidAdapter', function () {
             ]
           },
           eventtrackers: [
-            { event: 1, method: 1, url: 'https://click.me' },
-            { event: 1, method: 2, url: 'https://click-script.me' }
+            { event: 1, method: 1, url: 'https://eventrack.me/impression' },
+            { event: 1, method: 2, url: 'https://eventrack-js.me/impression-1' }
           ]
         };
 
@@ -845,9 +845,11 @@ describe('mediakeysBidAdapter', function () {
         expect(response[0].native.clickUrl).to.exist;
         expect(response[0].native.clickTrackers).to.exist;
         expect(response[0].native.clickTrackers.length).to.equal(1);
-        expect(response[0].native.javascriptTrackers).to.equal('<script src="https://click-script.me"></script>');
         expect(response[0].native.impressionTrackers).to.exist;
         expect(response[0].native.impressionTrackers.length).to.equal(1);
+        expect(response[0].native.impressionTrackers[0]).to.equal('https://eventrack.me/impression');
+        expect(response[0].native.javascriptTrackers).to.exist;
+        expect(response[0].native.javascriptTrackers).to.equal('<script async src="https://eventrack-js.me/impression-1"></script>');
       });
 
       it('should ignore eventtrackers with a unsupported type', function() {
@@ -859,6 +861,21 @@ describe('mediakeysBidAdapter', function () {
         expect(response[0].native.impressionTrackers).to.exist;
         expect(response[0].native.impressionTrackers.length).to.equal(0);
       })
+
+      it('Should handle multiple javascriptTrackers in one single string', () => {
+        const rawServerResponseNativeCopy = utils.deepClone(rawServerResponseNative);
+        const nativeObjectCopy = utils.deepClone(nativeObject);
+        nativeObjectCopy.eventtrackers.push(
+          {
+            event: 1,
+            method: 2,
+            url: 'https://eventrack-js.me/impression-2'
+          },)
+        rawServerResponseNativeCopy.body.seatbid[0].bid[0].adm = JSON.stringify(nativeObjectCopy);
+        const response = spec.interpretResponse(rawServerResponseNativeCopy, request);
+        const expected = '<script async src=\"https://eventrack-js.me/impression-1\"></script>\n<script async src=\"https://eventrack-js.me/impression-2\"></script>';
+        expect(response[0].native.javascriptTrackers).to.equal(expected);
+      });
     });
   });