diff --git a/nixos/doc/manual/release-notes/rl-1709.xml b/nixos/doc/manual/release-notes/rl-1709.xml
index f271451970a2..35534af1f1dc 100644
--- a/nixos/doc/manual/release-notes/rl-1709.xml
+++ b/nixos/doc/manual/release-notes/rl-1709.xml
@@ -107,7 +107,7 @@ rmdir /var/lib/ipfs/.ipfs
       The <literal>mysql</literal> default <literal>dataDir</literal> has changed from <literal>/var/mysql</literal> to <literal>/var/lib/mysql</literal>.
     </para>
     <para>
-      Radicale's default package has changed from 1.x to 2.x. Instructions to migrate can be found <link xlink:href="http://radicale.org/1to2/"> here </link>. It is also possible to use the newer version by setting the <literal>package</literal> to <literal>radicale2</literal>, which is done automatically when <literal>stateVersion</literal> is 17.09 or higher.
+      Radicale's default package has changed from 1.x to 2.x. Instructions to migrate can be found <link xlink:href="http://radicale.org/1to2/"> here </link>. It is also possible to use the newer version by setting the <literal>package</literal> to <literal>radicale2</literal>, which is done automatically when <literal>stateVersion</literal> is 17.09 or higher. The <literal>extraArgs</literal> option has been added to allow passing the data migration arguments specified in the instructions.
     </para>
   </listitem>
   <listitem>
diff --git a/nixos/modules/services/networking/radicale.nix b/nixos/modules/services/networking/radicale.nix
index f1b8edf43713..56f2e976cff5 100644
--- a/nixos/modules/services/networking/radicale.nix
+++ b/nixos/modules/services/networking/radicale.nix
@@ -48,6 +48,12 @@ in
         configuration file.
       '';
     };
+
+    services.radicale.extraArgs = mkOption {
+      type = types.listOf types.string;
+      default = [];
+      description = "Extra arguments passed to the Radicale daemon.";
+    };
   };
 
   config = mkIf cfg.enable {
@@ -71,7 +77,11 @@ in
       after = [ "network.target" ];
       wantedBy = [ "multi-user.target" ];
       serviceConfig = {
-        ExecStart = "${cfg.package}/bin/radicale -C ${confFile} -f";
+        ExecStart = concatStringsSep " " ([
+          "${cfg.package}/bin/radicale" "-C" confFile
+        ] ++ (
+          map escapeShellArg cfg.extraArgs
+        ));
         User = "radicale";
         Group = "radicale";
       };