diff --git a/INSTALL-OLD.md b/INSTALL-OLD.md
index b092c3c..f34e390 100644
--- a/INSTALL-OLD.md
+++ b/INSTALL-OLD.md
@@ -211,6 +211,7 @@ server {
 
     DocumentRoot "/srv/www/booru/client/public"
     FallbackResource /index.htm
+    AllowEncodedSlashes On
 </VirtualHost>
 ```