diff --git a/docs/api-output.md b/docs/api-output.md
index 4d0df918..f61988bf 100644
--- a/docs/api-output.md
+++ b/docs/api-output.md
@@ -303,6 +303,9 @@ Returns **Sharp**
 
 Use these AVIF options for output image.
 
+Whilst it is possible to create AVIF images smaller than 16x16 pixels,
+most web browsers do not display these properly.
+
 ### Parameters
 
 -   `options` **[Object][6]?** output options
diff --git a/lib/output.js b/lib/output.js
index 222ae3e4..1f9de935 100644
--- a/lib/output.js
+++ b/lib/output.js
@@ -560,6 +560,9 @@ function tiff (options) {
 /**
  * Use these AVIF options for output image.
  *
+ * Whilst it is possible to create AVIF images smaller than 16x16 pixels,
+ * most web browsers do not display these properly.
+ *
  * @since 0.27.0
  *
  * @param {Object} [options] - output options