diff --git a/README.md b/README.md
index 7c7c33d..6c0d4b8 100644
--- a/README.md
+++ b/README.md
@@ -38,7 +38,7 @@ server {
 
 Caching based only on file id can be enabled with this example configuration
 ```cfg
-location ~ /-([a-zA-Z0-9]+)/? {
+location ~ ^/-([a-zA-Z0-9]+) {
     # Other caching options are omitted here...
     proxy_cache_revalidate on;
     proxy_cache_key "$host$1";