diff --git a/custom_formats/HDR10.yml b/custom_formats/HDR10.yml
index 6952e9f..abd7e05 100644
--- a/custom_formats/HDR10.yml
+++ b/custom_formats/HDR10.yml
@@ -24,4 +24,9 @@ conditions:
   pattern: HLG
   required: true
   type: release_title
+- name: Not HDR10+
+  type: release_title
+  required: true
+  negate: true
+  pattern: HDR10+
 tests: []