diff --git a/README.md b/README.md
index 8ff2de4..532e51e 100644
--- a/README.md
+++ b/README.md
@@ -45,6 +45,7 @@ import ModalImage from "react-modal-image";
 | `hideZoom`             | `boolean` | Optional. Set to `true` to hide zoom-button from the Lightbox.                                                |
 | `showRotate`           | `boolean` | Optional. Set to `true` to show rotate-button within the Lightbox.                                            |
 | `imageBackgroundColor` | `String`  | Optional. Background color of the image shown in Lightbox. Defaults to black. Handy for transparent images.   |
+| `loading`              | `String`  | Optional. Set to `lazy` to lazy-load the thumbnail images.                                                    |
 
 ## Lightbox-only API for advanced usage
 
diff --git a/src/index.js b/src/index.js
index 5580377..40006d1 100644
--- a/src/index.js
+++ b/src/index.js
@@ -21,6 +21,7 @@ export default class extends Component {
       medium,
       large,
       alt,
+      loading,
       hideDownload,
       hideZoom,
       showRotate,
@@ -41,6 +42,7 @@ export default class extends Component {
           src={small}
           srcSet={smallSrcSet}
           alt={alt}
+          loading={loading}
         />
         {modalOpen && (
           <Lightbox