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diff --git a/README.md b/README.md
index 69adb27..07aae60 100644
--- a/README.md
+++ b/README.md
@@ -96,4 +96,6 @@ Alternatively you can run or install the experimental Nix flake:
 nix run git+https://git.skreutz.com/temp-postgres.git -- --help
 ```
 
+Try using Nix' `--refresh` flag, or adding `?ref=main&shallow=0` to the URL if you experience caching issues.
+
 See the [NixOS example](./examples/nixos) for how to install `temp-postgres` on NixOS using Nix flakes.