diff --git a/modules/build/config.nix b/modules/build/config.nix
index f91c795..092c221 100644
--- a/modules/build/config.nix
+++ b/modules/build/config.nix
@@ -35,6 +35,12 @@ with lib;
         readOnly = true;
         description = "Path to installation directory.";
       };
+
+      extraProotOptions = mkOption {
+        type = types.listOf types.string;
+        default = [];
+        description = "Extra options passed to proot, e.g., extra bind mounts.";
+      };
     };
 
   };
diff --git a/modules/environment/login/login.nix b/modules/environment/login/login.nix
index 9d7580c..e22cc6d 100644
--- a/modules/environment/login/login.nix
+++ b/modules/environment/login/login.nix
@@ -3,7 +3,7 @@
 { config, writeScript }:
 
 let
-  inherit (config.build) installationDir;
+  inherit (config.build) installationDir extraProotOptions;
 in
 
 writeScript "login" ''
@@ -36,5 +36,6 @@ writeScript "login" ''
     -b ${installationDir}/usr:/usr \
     -b /:/android \
     --link2symlink \
+    ${builtins.concatStringsSep " " extraProotOptions} \
     ${installationDir}/bin/sh ${installationDir}/usr/lib/login-inner "$@"
 ''