diff --git a/docs/api-input.md b/docs/api-input.md
index 76d76452..3774e02b 100644
--- a/docs/api-input.md
+++ b/docs/api-input.md
@@ -34,7 +34,7 @@ A Promises/A+ promise is returned when `callback` is not provided.
 -   `density`: Number of pixels per inch (DPI), if present
 -   `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 this TIFF, GIF or PDF image contains.
+-   `pages`: Number of pages/frames contained within the image, with support for TIFF, PDF, animated GIF and animated WebP
 -   `pageHeight`: Number of pixels high each page in this PDF image will be.
 -   `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 74831210..10155e0f 100644
--- a/lib/input.js
+++ b/lib/input.js
@@ -186,7 +186,7 @@ function clone () {
  * - `density`: Number of pixels per inch (DPI), if present
  * - `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 this TIFF, GIF or PDF image contains.
+ * - `pages`: Number of pages/frames contained within the image, with support for TIFF, PDF, animated GIF and animated WebP
  * - `pageHeight`: Number of pixels high each page in this PDF image will be.
  * - `hasProfile`: Boolean indicating the presence of an embedded ICC profile
  * - `hasAlpha`: Boolean indicating the presence of an alpha transparency channel