@@ -187,41 +187,18 @@
                     calendars = mkOption {
                       default = [ ];
                       description = ''
-                        Configuration for multiple calendars. This option will be appended to the
-                        singular calendar option if both are specified.
+                        Configuration for multiple calendars.
+
+                        See https://git.alin.ovh/mycal/blob/main/config.toml.example
                       '';
+
                       type = types.listOf (types.submodule {
-                        options = {
-                          file = mkOption {
-                            type = with types; nullOr str;
-                            default = null;
-                            example = "/path/to/calendar/file";
-                            description = ''
-                              Path to the calendar file. Preferred over URL.
-                            '';
-                          };
-                          url = mkOption {
-                            type = with types; nullOr str;
-                            default = null;
-                            example = "https://example.com/calendar.ics";
-                            description = ''
-                              URL to the calendar file.
-                            '';
-                          };
-                          all_tentative = mkOption {
-                            type = types.bool;
-                            default = false;
-                            description = ''
-                              Whether all events from this calendar should be marked as tentative.
-                            '';
-                          };
-                        };
+                        freeformType = settingsFormat.type;
                       });
                     };
 
                     email = mkOption {
                       type = types.str;
-                      default = "";
                       example = "john.doe@example.com";
                       description = ''
                         Email address of the user.
@@ -233,15 +210,6 @@ };
             };
 
             config = mkIf cfg.enable {
-              # Validate configuration
-              assertions = [
-                {
-                  assertion = with cfg.settings;
-                    (calendars != [ ] && builtins.any (cal: cal.file != "" || cal.url != "") calendars);
-                  message = "At least one calendar must be configured with either a file or URL in settings.calendars";
-                }
-              ];
-
               systemd.services.mycal = {
                 description = "Mycal Calendar Service";