diff --git a/docs/api-input.md b/docs/api-input.md
index 0455f59a..483671ec 100644
--- a/docs/api-input.md
+++ b/docs/api-input.md
@@ -16,7 +16,9 @@ A `Promise` is returned when `callback` is not provided.
 -   `chromaSubsampling`: String containing JPEG chroma subsampling, `4:2:0` or `4:4:4` for RGB, `4:2:0:4` or `4:4:4:4` for CMYK
 -   `isProgressive`: Boolean indicating whether the image is interlaced using a progressive scan
 -   `pages`: Number of pages/frames contained within the image, with support for TIFF, HEIF, PDF, animated GIF and animated WebP
--   `pageHeight`: Number of pixels high each page in this PDF image will be.
+-   `pageHeight`: Number of pixels high each page in a multi-page image will be.
+-   `loop`: Number of times to loop an animated image, zero refers to a continuous loop.
+-   `delay`: Delay in ms between each page in an animated image, provided as an array of integers.
 -   `pagePrimary`: Number of the primary page in a HEIF image
 -   `hasProfile`: Boolean indicating the presence of an embedded ICC profile
 -   `hasAlpha`: Boolean indicating the presence of an alpha transparency channel
diff --git a/lib/input.js b/lib/input.js
index 082693d8..5aa28278 100644
--- a/lib/input.js
+++ b/lib/input.js
@@ -167,7 +167,9 @@ function _isStreamInput () {
  * - `chromaSubsampling`: String containing JPEG chroma subsampling, `4:2:0` or `4:4:4` for RGB, `4:2:0:4` or `4:4:4:4` for CMYK
  * - `isProgressive`: Boolean indicating whether the image is interlaced using a progressive scan
  * - `pages`: Number of pages/frames contained within the image, with support for TIFF, HEIF, PDF, animated GIF and animated WebP
- * - `pageHeight`: Number of pixels high each page in this PDF image will be.
+ * - `pageHeight`: Number of pixels high each page in a multi-page image will be.
+ * - `loop`: Number of times to loop an animated image, zero refers to a continuous loop.
+ * - `delay`: Delay in ms between each page in an animated image, provided as an array of integers.
  * - `pagePrimary`: Number of the primary page in a HEIF image
  * - `hasProfile`: Boolean indicating the presence of an embedded ICC profile
  * - `hasAlpha`: Boolean indicating the presence of an alpha transparency channel