diff --git a/backend/pashub_fetcher/core_files.py b/backend/pashub_fetcher/core_files.py
index 07297653..72ef15f8 100644
--- a/backend/pashub_fetcher/core_files.py
+++ b/backend/pashub_fetcher/core_files.py
@@ -67,6 +67,8 @@ def core_file_for(
 ) -> Optional[CoreFiles]:
     if evidence_category is not None and evidence_category.lower() == "retrofit design":
         return CoreFiles.RETROFIT_DESIGN_DOC
+    if CoreFiles.IMPROVEMENT_OPTION_EVALUATION.value in filename:
+        return CoreFiles.IMPROVEMENT_OPTION_EVALUATION
     raise NotImplementedError