diff --git a/arkindex/schema.yml b/arkindex/schema.yml
index a8386919da20136f7b5380e0c5411a1ad0426b3e..7370a341490f249f3cf8994e6367465ee490fc5c 100644
--- a/arkindex/schema.yml
+++ b/arkindex/schema.yml
@@ -2974,6 +2974,13 @@ paths:
         required: false
         schema:
           type: string
+      - description: Filter elements by best class id
+        in: query
+        name: best_class
+        required: false
+        schema:
+          format: uuid
+          type: string
       - description: Restrict to or exclude elements with hidden types; they are excluded
           by default
         in: query
@@ -4047,6 +4054,13 @@ paths:
         schema:
           default: false
           type: boolean
+      - description: Filter elements by best class id
+        in: query
+        name: best_class
+        required: false
+        schema:
+          format: uuid
+          type: string
       - description: Restrict to or exclude elements with hidden types; they are excluded
           by default
         in: query
@@ -4357,6 +4371,13 @@ paths:
         schema:
           default: false
           type: boolean
+      - description: Filter elements by best class id
+        in: query
+        name: best_class
+        required: false
+        schema:
+          format: uuid
+          type: string
       - description: Restrict to or exclude elements with hidden types; they are excluded
           by default
         in: query