diff --git a/lib/cocina/models/presentation.rb b/lib/cocina/models/presentation.rb
index d73060b2..a51bfa0a 100644
--- a/lib/cocina/models/presentation.rb
+++ b/lib/cocina/models/presentation.rb
@@ -4,6 +4,8 @@ module Cocina
   module Models
     # Presentation data for the File.
     class Presentation < Struct
+      # Descriptive text about an image. This can be used as alt text or for indexing. This should be 130 characters or fewer as this is best practice for alt text.
+      attribute? :description, Types::Strict::String
       # Height in pixels
       attribute? :height, Types::Strict::Integer
       # Width in pixels
diff --git a/openapi.yml b/openapi.yml
index 8b0b39c9..720c0d40 100644
--- a/openapi.yml
+++ b/openapi.yml
@@ -1434,6 +1434,9 @@ components:
       type: object
       additionalProperties: false
       properties:
+        description:
+          description: Descriptive text about an image. This can be used as alt text or for indexing. This should be 130 characters or fewer as this is best practice for alt text.
+          type: string
         height:
           description: Height in pixels
           type: integer