diff --git a/overlays.nix b/overlays.nix
index 96eca69..825e3b9 100755
--- a/overlays.nix
+++ b/overlays.nix
@@ -82,6 +82,16 @@ let
     }
   );
 
+  # usage: nix-build ./dev.nix -A <package>.src.invalidated
+  overlays.withInvalidateFetcherByDrvHash = mkDerivationOverlay (
+    final: prev: prevStdenv: finalAttrs: prevAttrs: {
+      passthru = {
+        # invalidated = prevStdenv.mkDerivation prevAttrs;
+        invalidated = prev.invalidateFetcherByDrvHash prevStdenv.mkDerivation prevAttrs;
+      } // prevAttrs.passthru or { };
+    }
+  );
+
   # usage: nix-build ./dev.nix -A <package>.shellcheck
   overlays.withShellCheck = mkDerivationOverlay (
     final: prev: prevStdenv: finalAttrs: prevAttrs: