diff --git a/nixos/modules/programs/zsh/oh-my-zsh.nix b/nixos/modules/programs/zsh/oh-my-zsh.nix
index b7834fa5f872..b995d390b279 100644
--- a/nixos/modules/programs/zsh/oh-my-zsh.nix
+++ b/nixos/modules/programs/zsh/oh-my-zsh.nix
@@ -54,7 +54,7 @@ in
           type = types.str;
           description = ''
             Cache directory to be used by `oh-my-zsh`.
-            Default is /nix/store/<oh-my-zsh>/cache.
+            Without this option it would default to the read-only nix store.
           '';
         };
       };