diff --git a/opds-2.0.md b/opds-2.0.md
index 513d2ed..1bf77dd 100644
--- a/opds-2.0.md
+++ b/opds-2.0.md
@@ -174,7 +174,7 @@ This new collection role is mostly meant to support responsive images across all
 
 Link Objects in `images` <em class="rfc">may</em> include any number of image format, resolution or aspect ratio.
 
-At least one image resource <em class="rfc">must</em> use one of the following formats: `image/jpeg`, `image/png` or `image/gif`.
+At least one image resource <em class="rfc">must</em> use one of the following formats: `image/jpeg`, `image/avif`, `image/png` or `image/gif`.
 
 **Example**
 
diff --git a/schema/publication.schema.json b/schema/publication.schema.json
index 3d57266..e3f50bc 100644
--- a/schema/publication.schema.json
+++ b/schema/publication.schema.json
@@ -58,12 +58,13 @@
       "minItems": 1,
       "allOf": [
         {
-          "description": "At least one image resource must use one of the following formats: image/jpeg, image/png or image/gif.",
+          "description": "At least one image resource must use one of the following formats: image/jpeg, image/avif, image/png or image/gif.",
           "contains": {
             "properties": {
               "type": {
                 "enum": [
                   "image/jpeg",
+                  "image/avif",
                   "image/png",
                   "image/gif"
                 ]