diff --git a/sql/openalex_ids.sql b/sql/openalex_ids.sql
index 59f629a..6ceffdf 100644
--- a/sql/openalex_ids.sql
+++ b/sql/openalex_ids.sql
@@ -6,4 +6,5 @@ WHERE
   (type IS NULL)
   OR NOT (type IN ("dataset",
       "peer-review",
-      "grant"))
+      "grant",
+      "supplementary-materials"))