diff --git a/README.md b/README.md
index 477eb809..621e38fc 100644
--- a/README.md
+++ b/README.md
@@ -129,7 +129,7 @@ By default, the container will download the latest version of the "vanilla" [Min
       * [Enabling Autopause](#enabling-autopause)
    * [Running on RaspberryPi](#running-on-raspberrypi)
 
-<!-- Added by: runner, at: Mon Sep 20 02:33:20 UTC 2021 -->
+<!-- Added by: runner, at: Sat Sep 25 14:39:20 UTC 2021 -->
 
 <!--te-->
 
@@ -779,6 +779,8 @@ values.
 
 ### Whitelist Players
 
+> **NOTE** it is very important to set this with servers exposed to the internet where you want only limited players to join.
+
 To whitelist players for your Minecraft server, pass the Minecraft usernames separated by commas via the `WHITELIST` environment variable, such as
 
     docker run -d -e WHITELIST=user1,user2 ...
diff --git a/start-setupModpack b/start-setupModpack
index a037b8f2..92cb9811 100755
--- a/start-setupModpack
+++ b/start-setupModpack
@@ -22,7 +22,7 @@ if [[ "$MODPACK" ]]; then
     if [[ "${MODPACK}" == *.zip ]]; then
       downloadUrl="${MODPACK}"
     else
-      downloadUrl=$(curl -Ls -o /dev/null -w %{effective_url} $MODPACK)
+      downloadUrl=$(curl -Ls -o /dev/null -w %{url_effective} $MODPACK)
       if ! [[ $downloadUrl == *.zip ]]; then
         log "ERROR Invalid URL given for MODPACK: $downloadUrl resolved from $MODPACK"
         log "      Must be HTTP, HTTPS or FTP and a ZIP file"