diff --git a/nix/modules/default/default.nix b/nix/modules/default/default.nix
index 92873a71..37912a83 100644
--- a/nix/modules/default/default.nix
+++ b/nix/modules/default/default.nix
@@ -44,14 +44,40 @@ in
             type = types.nonEmptyStr;
             readOnly = true;
             description = ''
-              The path to store persistent data in.
+              The path to store database files in.
 
               Note that this is read-only because this module makes use of
               systemd's `StateDirectory` option.
             '';
             default = if cfg.settings.conduit_compat
-              then "/var/lib/matrix-conduit"
-              else "/var/lib/grapevine";
+              then "/var/lib/matrix-conduit/database"
+              else "/var/lib/grapevine/database";
+          };
+          media.backend = {
+            type = lib.mkOption {
+              type = types.nonEmptyStr;
+              readOnly = true;
+              description = ''
+                The media backend to use.
+
+                Note that this is read-only because `filesystem` is currently
+                the only valid option.
+              '';
+              default = "filesystem";
+            };
+            path = lib.mkOption {
+              type = types.nonEmptyStr;
+              readOnly = true;
+              description = ''
+                The path to store database files in.
+
+                Note that this is read-only because this module makes use of
+                systemd's `StateDirectory` option.
+              '';
+              default = if cfg.settings.conduit_compat
+                then "/var/lib/matrix-conduit/media"
+                else "/var/lib/grapevine/media";
+            };
           };
           listen = lib.mkOption {
             type = types.listOf format.type;