diff --git a/setup/templates/steps/compose/03_expose.html b/setup/templates/steps/compose/03_expose.html
index c1d3ca8c..77b43640 100644
--- a/setup/templates/steps/compose/03_expose.html
+++ b/setup/templates/steps/compose/03_expose.html
@@ -16,10 +16,11 @@ avoid generic all-interfaces addresses like <code>0.0.0.0</code> or <code>::</co
 <div class="form-group">
   <label>IPv4 listen address</label>
 <!--   Validates IPv4 address -->
-  <input class="form-control" type="text" name="bind4" value="127.0.0.1" 
+  <input class="form-control" type="text" name="bind4" value="127.0.0.1"
   		pattern="^((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$">
-  <label>Subnet of the docker network. This should not conflict with any networks to which your system is connected. (Internal and external!)</label>
-  <input class="form-control" type="text" name="subnet" required pattern="^([0-9]{1,3}\.){3}[0-9]{1,3}(\/([0-9]|[1-2][0-9]|3[0-2]))$"
+  <label>Subnet of the docker network. This should not conflict with any networks to which your system is connected. (Internal and external!)
+    Fourth number is always 0. Normally the format is '*.*.*.0/24'</label>
+  <input class="form-control" type="text" name="subnet" required pattern="^([0-9]{1,3}\.){3}[0](\/([0-9]|[1-2][0-9]|3[0-2]))$"
     value="192.168.203.0/24">
 </div>