diff --git a/docs/usage.md b/docs/usage.md
index ed6b7e64d..832ad1f1a 100644
--- a/docs/usage.md
+++ b/docs/usage.md
@@ -915,14 +915,6 @@ original_filename:invoice.pdf
 - `original_filename` matches the filename of the document as originally
   consumed.
 
-Older, undocumented `*_id` field prefixes (`tag_id`, `owner_id`, `viewer_id`,
-`correspondent_id`, `document_type_id`, `storage_path_id`, `type_id`, and
-`path_id`) are no longer recognized advanced-search fields. A query using one
-of them (e.g. `tag_id:5`) does not error; it silently falls back to a literal
-text search for that string, which will almost never match real document
-content. Use the corresponding named field (`tag`, `correspondent`,
-`document_type`, etc.) instead.
-
 Matching inexact words:
 
 ```