diff --git a/lib/configuration.js b/lib/configuration.js
index ef4d97f42e2609563a792783337bbc04f2697663..4cf81a9a92456fd78ad0531fd9c37e2620982bd2 100644
--- a/lib/configuration.js
+++ b/lib/configuration.js
@@ -223,6 +223,10 @@ var conf = module.exports = convict({
   enable_development_menu: {
     doc: "Whether or not the development menu can be accessed",
     format: 'boolean = false'
+  },
+  proxy_idps: {
+    doc: "A mapping of domain names to urls, which maps popular email services to shimmed IDP deployments.",
+    format: 'object { } *?'
   }
 });