diff --git a/management/templates/index.html b/management/templates/index.html
index 1bbd0378..d88eb569 100644
--- a/management/templates/index.html
+++ b/management/templates/index.html
@@ -180,8 +180,8 @@
 		<hr>
 
 		<footer>
-			<p>This is a <a href="https://github.com/ddavness/power-mailinabox">Power Mail-in-a-Box</a>. (Debian
-				GNU/Linux 10)</p>
+			<p>This is a <a href="https://github.com/ddavness/power-mailinabox">Power Mail-in-a-Box</a>. (via __OSTAG__)
+			</p>
 		</footer>
 	</div> <!-- /container -->
 
diff --git a/setup/preflight.sh b/setup/preflight.sh
index 51952693..6a3101d1 100644
--- a/setup/preflight.sh
+++ b/setup/preflight.sh
@@ -18,6 +18,8 @@ if [ "$OS" != "Debian GNU/Linux 10 (buster)" -a "$OS" != "Ubuntu 20.04 LTS" ]; t
 	exit 1
 fi
 
+sed -i "s/__OSTAG__/$OS/g" management/templates/index.html
+
 # Check that we have enough memory.
 #
 # /proc/meminfo reports free memory in kibibytes. Our baseline will be 512 MB,