diff --git a/management/utils.py b/management/utils.py
index 3f872376..f2df5ad0 100644
--- a/management/utils.py
+++ b/management/utils.py
@@ -180,6 +180,8 @@ def wait_for_service(port, public, env, timeout):
 		time.sleep(min(timeout/4, 1))
 
 def get_php_version():
+	# Gets the version of PHP used by Mail-in-a-Box
+	# To modify PHP version, also update variable PHP_VER in functions.sh
 	return "8.1"
 
 def get_ssh_port():
diff --git a/management/web_update.py b/management/web_update.py
index ba853468..cef15f6e 100644
--- a/management/web_update.py
+++ b/management/web_update.py
@@ -82,6 +82,7 @@ def do_web_update(env):
 
 	# Build an nginx configuration file.
 	nginx_conf = read_conf("nginx-top.conf")
+	# Hardcode php version in the nginx configuration file
 	nginx_conf = re.sub("{{phpver}}", get_php_version(), nginx_conf)
 
 	# Load the templates.
diff --git a/setup/functions.sh b/setup/functions.sh
index 85925e6c..46355dde 100644
--- a/setup/functions.sh
+++ b/setup/functions.sh
@@ -5,6 +5,7 @@
 # -o pipefail: don't ignore errors in the non-last command in a pipeline
 set -euo pipefail
 
+# To modify PHP version, also update method get_php_version() in utils.py
 PHP_VER=8.1
 
 function hide_output {