diff --git a/docs/api-guide/filtering.md b/docs/api-guide/filtering.md
index d305ede6b..3e004ed8b 100644
--- a/docs/api-guide/filtering.md
+++ b/docs/api-guide/filtering.md
@@ -226,6 +226,7 @@ The search behavior may be restricted by prepending various characters to the `s
 * '=' Exact matches.
 * '@' Full-text search.  (Currently only supported Django's [PostgreSQL backend](https://docs.djangoproject.com/en/dev/ref/contrib/postgres/search/).)
 * '$' Regex search.
+* '&' Accent-insensitive search.  (Currently only supported Django's [PostgreSQL backend](https://docs.djangoproject.com/en/dev/ref/contrib/postgres/lookups/#unaccent).)
 
 For example: