diff --git a/docs/reference.md b/docs/reference.md
index c1e6eb8511ab1af935be4dfebccbd0cee1823f3b..ab3e5a25eb9d533e54741c60b57cab52cec3329b 100644
--- a/docs/reference.md
+++ b/docs/reference.md
@@ -2494,9 +2494,12 @@ attributes that specify static DNS entries that will be added to
 `nginx_cache_keys_mem` is the memory size of the key buffer for the
 global NGINX HTTP cache.
 
-`nginx_cache_fs_size` is the maximum on-disk size of the NGINX HTTP
-cache (note that NGINX might use as much as twice what specified here,
-depending on expiration policy).
+`nginx_cache_custom_params` are additional parameters for customizing
+the *proxy_cache_path* NGINX configuration directive for the global
+cache. The most important attribute you might want to set is possibly
+*max_size*, which controls the maximum size of the on-disk cache (note
+that NGINX might use as much as twice what specified, depending on
+expiration policy).
 
 `nginx_global_custom_headers` - a dictionary of {header: value} pairs
 corresponding to HTTP headers that must be set on *every* response.