diff --git a/nixos/modules/config/users-groups.nix b/nixos/modules/config/users-groups.nix
index e9ce9d5e411..16e387a44c0 100644
--- a/nixos/modules/config/users-groups.nix
+++ b/nixos/modules/config/users-groups.nix
@@ -142,7 +142,7 @@ let
       homeMode = mkOption {
         type = types.strMatching "[0-7]{1,5}";
         default = "700";
-        description = "The user's home directory mode in numeric format. See chmod(1).";
+        description = "The user's home directory mode in numeric format. See chmod(1). The mode is only applied if <option>users.users.&lt;name&gt;.createHome</option> is true.";
       };
 
       cryptHomeLuks = mkOption {