diff --git a/README.md b/README.md
index 90f0fa8..7c7c33d 100644
--- a/README.md
+++ b/README.md
@@ -36,6 +36,16 @@ server {
 }
 ```
 
+Caching based only on file id can be enabled with this example configuration
+```cfg
+location ~ /-([a-zA-Z0-9]+)/? {
+    # Other caching options are omitted here...
+    proxy_cache_revalidate on;
+    proxy_cache_key "$host$1";
+    # Other options omitted...
+}
+```
+
 Then run with `./ngfshare -config /path/to/config.json`. To generate an auth key, run `./ngfshare -config /path/to/config.json -genauth`.
 
 ## Api