diff --git a/metube.subfolder.conf.sample b/metube.subfolder.conf.sample
index 42b7523..99e5fa0 100644
--- a/metube.subfolder.conf.sample
+++ b/metube.subfolder.conf.sample
@@ -1,4 +1,4 @@
-# set the URLPREFIX environment variable for the metube container to "/metube"
+# set the URL_PREFIX environment variable for the metube container to "/metube"
 
 location /metube {
     # enable the next two lines for http auth
@@ -19,4 +19,4 @@ location /metube {
     set $upstream_proto http;
     proxy_pass $upstream_proto://$upstream_app:$upstream_port;
 
-}
\ No newline at end of file
+}