diff --git a/README.md b/README.md
index 2379e42..17abc5c 100644
--- a/README.md
+++ b/README.md
@@ -50,8 +50,8 @@ EINTOPF_AUTHORIZATION_TOKEN=foobar23
 services.mail-quota-warning = {
   enable = true;
   settings = {
-    EINTOPF_URL = "https://karlsunruh.eintopf.info";
-    RADAR_GROUP_ID = "436012";
+    CHECK_INTERVAL_DAYS = 7;
+    QUOTA_WARNING_THRESHOLD_PERCENT = 80;    
   };
   secrets = [ /etc/mail-quota-warning-secrets.yml ];
 };
@@ -64,8 +64,7 @@ Replace setting variables according to your setup.
 ```
 cd mail-quota-warning
 nix develop
-export EINTOPF_URL = "https://karlsunruh.eintopf.info"
-export EINTOPF_AUTHORIZATION_TOKEN = "secret key"
-export RADAR_GROUP_ID = "436012"
+export CHECK_INTERVAL_DAYS=7
+export QUOTA_WARNING_THRESHOLD_PERCENT=80
 nix run
 ```
diff --git a/module.nix b/module.nix
index 67061ed..9b21493 100644
--- a/module.nix
+++ b/module.nix
@@ -19,32 +19,34 @@ in
 
         settings = lib.mkOption {
           type = lib.types.submodule {
-            freeformType = with lib.types; attrsOf types.str;
+            freeformType = with lib.types; attrsOf types.str types.int;
             options = {
               CHECK_INTERVAL_DAYS = lib.mkOption {
                 default = 7;
                 type = lib.types.int;
                 description = ''
-		  Base URL of the target Eintopf host.
+                  Interval of days in which a warning message will be
+                  delivered.
                 '';
               };
               QUOTA_WARNING_THRESHOLD_PERCENT = lib.mkOption {
                 default = 80;
                 type = lib.types.int;
                 description = ''
-		  Radar group ID which events to sync.
+		              Threshold of used mailbox space in percent after which
+                  a warning message will be delivered.
                 '';
               };
 	    };
           };
           default = {};
           description = ''
-            Extra options which should be used by the Radar sync script.
+            Extra options which should be used by the mailbox quota warning script.
           '';
           example = lib.literalExpression ''
             {
-              EINTOPF_URL = "eintopf.info";
-    	        QUOTA_WARNING_RADAR_GROUP_ID = "436012";
+              CHECK_INTERVAL_DAYS = 7;
+    	        QUOTA_WARNING_THRESHOLD_PERCENT = 80;
             }
           '';
         };