diff --git a/custom_signatures.json b/custom_signatures.json
index b8c0df6..715cbc6 100644
--- a/custom_signatures.json
+++ b/custom_signatures.json
@@ -156,6 +156,6 @@
         "puid": "aca-fmt/21",
         "signature": "OpenDocument Spreadsheet (unspecified version)",
         "extension": ".ods",
-        "decode bof": "mimetypeapplication/vnd.oasis.opendocument.spreadsheet"
+        "plain_bof": "mimetypeapplication/vnd.oasis.opendocument.spreadsheet"
     }
 ]