diff --git a/README.md b/README.md
index f1bddcde..6b282c01 100644
--- a/README.md
+++ b/README.md
@@ -45,7 +45,8 @@ but before proceeding with either you need to set the environment variables.
 | `NB_API_QUERY_URL`       | string  | Yes                                      | -                        | `https://federate.neurobagel.org/`                        |
 | `NB_QUERY_APP_BASE_PATH` | string  | No                                       | `/`                      | `/query/`                                                 |
 | `NB_ENABLE_AUTH`         | boolean | No                                       | `false`                  | `false`                                                   |
-| `NB_QUERY_CLIENT_ID`     | string  | Yes (if `NB_ENABLE_AUTH` is set to true) | -                        | `46923719231972-dhsahgasl3123.apps.googleusercontent.com` |
+| `NB_QUERY_CLIENT_ID`     | string  | Yes (if `NB_ENABLE_AUTH` is set to true) | -                        | `""`                                                      |
+| `NB_QUERY_HEADER_SCRIPT` | string  | No                                       | `""`                     | `'<script defer data-domain="mydomain" src="plausible">'` |
 
 #### `NB_API_QUERY_URL`
 
@@ -64,6 +65,17 @@ If the API you'd like to send queries to requires authentication, you need to se
 If the `NB_ENABLE_AUTH` is set to `true` (it is `false` by default), you need to provide a valid client ID for the authentication.
 _At the moment, query tool uses Google for authentication, so you need to obtain a client ID from Google developer console. See [documentation](https://developers.google.com/identity/gsi/web/guides/get-google-api-clientid) for more information._
 
+#### `NB_QUERY_HEADER_SCRIPT`
+
+If you want to add a custom script to the header of the query tool, you can set the `NB_QUERY_HEADER_SCRIPT` environment variable to the script you want to add.
+This script will be added to the header of the query tool. For example, in our production deployment we use the GDPR aware analytics tool [Plausible](https://plausible.io/),
+so we set the `NB_QUERY_HEADER_SCRIPT` to the script provided by Plausible.
+When you use this variable, make sure you use single quotes to include the script like so:
+
+```bash
+NB_QUERY_HEADER_SCRIPT='<script defer data-domain="mydomain" src="plausible">'
+```
+
 #### Set the environment variables
 
 To set environment variables, create a `.env` file in the root directory and add the environment variables there. If you're running a neurobagel node-API locally on your machine (following the instructions [here](https://github.com/neurobagel/api#local-installation)), your `.env` file would look something like this:
diff --git a/entrypoint.sh b/entrypoint.sh
index 12ceb6b2..6d8fac7a 100644
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -18,7 +18,7 @@ fi
 for file in $(find /usr/share/nginx/html -type f \( -name "*.js" -o -name "*.html" \)); do
   sed -i "s|REPLACE_ME_NB_API_QUERY_URL_REPLACE_ME|${NB_API_QUERY_URL}|g" "$file"
   sed -i "s|REPLACE_ME_NB_ENABLE_AUTH_REPLACE_ME|${NB_ENABLE_AUTH:-false}|g" "$file"
-  sed -i "s|REPLACE_ME_NB_QUERY_CLIENT_ID_REPLACE_ME|${NB_QUERY_CLIENT_ID:-testclient1234}|g" "$file"
+  sed -i "s|REPLACE_ME_NB_QUERY_CLIENT_ID_REPLACE_ME|${NB_QUERY_CLIENT_ID}|g" "$file"
   sed -i "s|REPLACE_ME_NB_ENABLE_CHATBOT_REPLACE_ME|${NB_ENABLE_CHATBOT:-false}|g" "$file"
   sed -i "s|REPLACE_ME_NB_QUERY_APP_BASE_PATH_REPLACE_ME|${NB_QUERY_APP_BASE_PATH:-/}|g" "$file"
   sed -i "s|<!-- REPLACE_ME_NB_QUERY_HEADER_SCRIPT_REPLACE_ME -->|${NB_QUERY_HEADER_SCRIPT}|g" "$file"