diff --git a/src/js/plyr.d.ts b/src/js/plyr.d.ts
index 9e336017..cdd5cd4c 100644
--- a/src/js/plyr.d.ts
+++ b/src/js/plyr.d.ts
@@ -496,6 +496,11 @@ declare namespace Plyr {
      * Youtube Player Options.
      */
     youtube?: object;
+
+    /**
+     * Preview Thumbnails Options.
+     */
+    previewThumbnails?: PreviewThumbnailsOptions;
   }
 
   interface QualityOptions {
@@ -545,6 +550,11 @@ declare namespace Plyr {
     key?: string;
   }
 
+  interface PreviewThumbnailsOptions {
+    enabled?: boolean;
+    src?: string;
+  }
+
   interface SourceInfo {
     /**
      * Note: YouTube and Vimeo are currently not supported as audio sources.