diff --git a/foxyproxy/10-redefine.yml b/foxyproxy/10-redefine.yml
new file mode 100644
index 0000000..83578f0
--- /dev/null
+++ b/foxyproxy/10-redefine.yml
@@ -0,0 +1,15 @@
+---
+proxies:
+  username:
+    redefine: true
+    mandatory: false
+
+  password:
+    redefine: true
+    hidden:
+      type: jinja
+      jinja: |
+        {% if not _.username %}
+        no username defined
+        {% endif %}
+      description: if username is not defined