diff --git a/docs/ref/utils.txt b/docs/ref/utils.txt
index 17447ba757..a79320fced 100644
--- a/docs/ref/utils.txt
+++ b/docs/ref/utils.txt
@@ -82,7 +82,7 @@ need to distinguish caches by the ``Accept-language`` header.
         Handling an asterisk ``'*'`` according to :rfc:`7231#section-7.1.4` was
         added.
 
-.. function:: get_cache_key(request, key_prefix=None)
+.. function:: get_cache_key(request, key_prefix=None, method='GET', cache=None)
 
     Returns a cache key based on the request path. It can be used in the
     request phase because it pulls the list of headers to take into account