diff --git a/src/app/+item-page/media-viewer/media-viewer.component.ts b/src/app/+item-page/media-viewer/media-viewer.component.ts
index 84f4d3d372..d0712057e4 100644
--- a/src/app/+item-page/media-viewer/media-viewer.component.ts
+++ b/src/app/+item-page/media-viewer/media-viewer.component.ts
@@ -93,7 +93,10 @@ export class MediaViewerComponent implements OnInit {
         take(1)
       );
   }
-
+  
+  /**
+   * This method MediaViewerItem from incoming bitstreams
+   */
   createMediaViewerItem(
     original: Bitstream,
     format: BitstreamFormat,
diff --git a/src/environments/environment.common.ts b/src/environments/environment.common.ts
index 2f3e38a5f1..c1260c8cb6 100644
--- a/src/environments/environment.common.ts
+++ b/src/environments/environment.common.ts
@@ -229,6 +229,9 @@ export const environment: GlobalConfig = {
   },
   // Whether the UI should rewrite file download URLs to match its domain. Only necessary to enable when running UI and REST API on separate domains
   rewriteDownloadUrls: false,
+  // Whether to enable media viewer for image and/or video Bitstreams (i.e. Bitstreams whose MIME type starts with "image" or "video").  
+  // For images, this enables a gallery viewer where you can zoom or page through images. 
+  // For videos, this enables embedded video streaming
   mediaViewer: {
     image: false,
     video: false,
diff --git a/src/environments/mock-environment.ts b/src/environments/mock-environment.ts
index 42ea473665..b462adc57f 100644
--- a/src/environments/mock-environment.ts
+++ b/src/environments/mock-environment.ts
@@ -199,6 +199,6 @@ export const environment: Partial<GlobalConfig> = {
   },
   mediaViewer: {
     image: true,
-    video: true,
+    video: true
   },
 };